{"id":4204,"date":"2025-12-19T20:06:01","date_gmt":"2025-12-19T12:06:01","guid":{"rendered":"https:\/\/www.pgeneral.com\/?p=4204"},"modified":"2025-12-22T14:07:19","modified_gmt":"2025-12-22T06:07:19","slug":"how-mossbauer-spectrometer-resolution-affects-isomer-shift-accuracy","status":"publish","type":"post","link":"https:\/\/www.pgeneral.com\/vi\/news\/how-mossbauer-spectrometer-resolution-affects-isomer-shift-accuracy\/","title":{"rendered":"\u0110\u1ed9 ph\u00e2n gi\u1ea3i m\u00e1y quang ph\u1ed5 Mossbauer \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c chuy\u1ec3n \u0111\u1ed5i isomer nh\u01b0 th\u1ebf n\u00e0o?"},"content":{"rendered":"

\"\u0110\u1ed9Ph\u1ed5 quang h\u1ecdc Mossbauer s\u1eed d\u1ee5ng ph\u00e1t x\u1ea1 v\u00e0 h\u1ea5p th\u1ee5 tia gamma kh\u00f4ng ph\u1ea3n \u1ee9ng \u0111\u1ec3 nghi\u00ean c\u1ee9u c\u00e1c t\u01b0\u01a1ng t\u00e1c si\u00eau m\u1ecbn. M\u1ed9t v\u00ed d\u1ee5 ch\u00ednh l\u00e0 s\u1ef1 thay \u0111\u1ed5i isomer. S\u1ef1 thay \u0111\u1ed5i n\u00e0y cho th\u1ea5y m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eed \u0111\u1ecba ph\u01b0\u01a1ng c\u1ee7a h\u1ea1t nh\u00e2n nh\u01b0 ^57Fe. \u0110\u1ed9 ch\u00ednh x\u00e1c trong vi\u1ec7c \u0111o s\u1ef1 thay \u0111\u1ed5i isomer l\u00e0 r\u1ea5t quan tr\u1ecdng. N\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c tr\u1ea1ng th\u00e1i oxy h\u00f3a v\u00e0 li\u00ean k\u1ebft h\u00f3a h\u1ecdc. \u0110\u1ed9 ch\u00ednh x\u00e1c n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o\u00a0<\/b><\/strong>m\u00e1y \u0111o ph\u1ed5<\/b><\/u><\/strong><\/a>‘ \u0110\u1ed9 ph\u00e2n gi\u1ea3i S. B\u1ea1n c\u00f3 th\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao th\u00f4ng qua hi\u1ec7u chu\u1ea9n t\u1ed1c \u0111\u1ed9 c\u1ea9n th\u1eadn. Thi\u1ebft b\u1ecb \u1ed5n \u0111\u1ecbnh v\u00e0 thi\u1ebft l\u1eadp th\u00ed nghi\u1ec7m t\u1ed1t c\u0169ng quan tr\u1ecdng. Ch\u00fang bao g\u1ed3m c\u00e1c ch\u1ea5t h\u1ea5p th\u1ee5 m\u1ecfng v\u00e0 nhi\u1ec7t \u0111\u1ed9 m\u00e1t. C\u00e1c b\u01b0\u1edbc nh\u01b0 v\u1eady l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 t\u00e1ch c\u00e1c \u0111\u1ec9nh quang ph\u1ed5 g\u1ea7n \u0111\u00f3. Ch\u00fang ng\u0103n ch\u1eb7n s\u1ef1 tr\u1ed9n l\u1eabn c\u00e1c \u0111i\u1ec3m h\u00f3a h\u1ecdc kh\u00e1c nhau. Cu\u1ed1i c\u00f9ng, \u0111i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn ph\u00e2n t\u00edch d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady v\u00e0 h\u1eefu \u00edch. C\u00e1c nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i \u0111\u1eb1ng sau quang ph\u1ed5 Mossbauer l\u00e0 g\u00ec v\u00e0 \u0111\u1ed9 ph\u00e2n gi\u1ea3i ph\u00f9 h\u1ee3p nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n

Ph\u00e2n ph\u1ed5 Mossbauer l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p h\u1ea1t nh\u00e2n. N\u00f3 cung c\u1ea5p chi ti\u1ebft s\u00e2u s\u1eafc v\u1ec1 thi\u1ebft l\u1eadp \u0111\u1ecba ph\u01b0\u01a1ng c\u1ee7a m\u1ed9t s\u1ed1 \u0111\u1ed3ng v\u1ecb nh\u1ea5t \u0111\u1ecbnh. ^ 57Fe l\u00e0 m\u1ed9t lo\u1ea1i ph\u1ed5 bi\u1ebfn. \u00dd t\u01b0\u1edfng ch\u00ednh l\u00e0 s\u1ef1 h\u1ea5p th\u1ee5 v\u00e0 ph\u00e1t x\u1ea1 c\u1ed9ng h\u01b0\u1edfng tia gamma kh\u00f4ng ph\u1ea3n \u1ee9ng. C\u00e1c chuy\u00ean gia g\u1ecdi \u0111\u00e2y l\u00e0 hi\u1ec7u \u1ee9ng Mossbauer. Khi m\u1ed9t h\u1ea1t nh\u00e2n ph\u00e1t ra ho\u1eb7c h\u1ea5p th\u1ee5 m\u1ed9t photon gamma m\u00e0 kh\u00f4ng c\u00f3 ph\u1ea3n \u1ee9ng, b\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ed5. Ph\u1ed5 n\u00e0y cho th\u1ea5y c\u00e1c t\u01b0\u01a1ng t\u00e1c si\u00eau tinh t\u1ebf. Ch\u00fang bao g\u1ed3m s\u1ef1 thay \u0111\u1ed5i isomer, t\u00e1ch b\u1ed1n c\u1ef1c v\u00e0 t\u00e1ch si\u00eau m\u1ecbn t\u1eeb. C\u00e1c chi ti\u1ebft nh\u01b0 v\u1eady gi\u00fap gi\u1ea3i th\u00edch c\u00e1c tr\u1ea1ng th\u00e1i oxy h\u00f3a, m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eed v\u00e0 tr\u1eadt t\u1ef1 t\u1eeb trong v\u1eadt li\u1ec7u.<\/p>\n

B\u1ea1n ph\u1ea3i c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao \u0111\u1ec3 r\u00fat ra nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m quang ph\u1ed5 tinh t\u1ebf n\u00e0y m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. Trong m\u00e1y quang ph\u1ed5 Mossbauer, \u0111\u1ed9 ph\u00e2n gi\u1ea3i ch\u1ee7 y\u1ebfu \u0111\u1ebfn t\u1eeb hi\u1ec7u chu\u1ea9n quy m\u00f4 t\u1ed1c \u0111\u1ed9 v\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a c\u00e1c \u0111\u1ec9nh c\u1ed9ng h\u01b0\u1edfng. Nh\u1eefng th\u1ee9 nh\u01b0 ngu\u1ed3n ph\u00f3ng x\u1ea1’ Ch\u1ea5t l\u01b0\u1ee3ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111i\u1ec1u n\u00e0y. \u0110\u1ed9 d\u00e0y c\u1ee7a b\u1ed9 h\u1ea5p th\u1ee5 v\u00e0 hi\u1ec7u qu\u1ea3 c\u1ee7a m\u00e1y d\u00f2 c\u0169ng \u0111\u00f3ng m\u1ed9t vai tr\u00f2. H\u1ec7 th\u1ed1ng l\u00e1i t\u1ed1c \u0111\u1ed9 Doppler l\u00e0 trung t\u00e2m. N\u00f3 thay \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng tia gamma m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn. B\u1ea5t k\u1ef3 v\u1ea5n \u0111\u1ec1 n\u00e0o v\u1edbi c\u01a1 h\u1ecdc ho\u1eb7c \u0111i\u1ec7n t\u1eed \u1edf \u0111\u00e2y c\u00f3 th\u1ec3 bi\u1ebfn d\u1ea1ng ph\u1ed5.<\/p>\n

T\u1ea1i sao \u0111\u1ed9 ph\u00e2n gi\u1ea3i thi\u1ebft b\u1ecb r\u1ea5t quan tr\u1ecdng cho ph\u00e9p \u0111o chuy\u1ec3n \u0111\u1ed5i isomer?<\/b><\/strong><\/h2>\n

S\u1ef1 thay \u0111\u1ed5i \u0111\u1ed3ng ph\u00e2n (\u03b4) \u0111\u1ebfn t\u1eeb s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 m\u1eadt \u0111\u1ed9 s-electron t\u1ea1i h\u1ea1t nh\u00e2n. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra gi\u1eefa nguy\u00ean t\u1eed h\u1ea5p th\u1ee5 v\u00e0 nguy\u00ean t\u1eed ngu\u1ed3n. S\u1ef1 thay \u0111\u1ed5i ch\u1ec9 \u0111\u1ebfn s\u1ef1 thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i oxy h\u00f3a. N\u00f3 c\u0169ng cho th\u1ea5y c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m li\u00ean k\u1ebft \u0111\u1ed3ng gi\u00e1 v\u00e0 h\u00ecnh d\u1ea1ng ph\u1ed1i h\u1ee3p. V\u00ed d\u1ee5, Fe ^ 2 th\u01b0\u1eddng c\u00f3 \u03b4 l\u1edbn h\u01a1n Fe ^ 3. V\u00ec v\u1eady, chuy\u1ec3n \u0111\u1ed5i isomer l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 c\u01a1 b\u1ea3n trong c\u00f4ng vi\u1ec7c \u0111\u1ecba h\u00f3a v\u00e0 x\u00fac t\u00e1c.<\/p>\n

Nh\u01b0ng n\u1ebfu m\u00e1y quang ph\u1ed5 c\u1ee7a b\u1ea1n’ \u0110\u1ed9 ph\u00e2n gi\u1ea3i s th\u1ea5p, nh\u1eefng thay \u0111\u1ed5i nh\u1ecf trong gi\u00e1 tr\u1ecb \u03b4 b\u1ecb m\u1ea5t trong c\u00e1c \u0111\u01b0\u1eddng ph\u1ed5 r\u1ed9ng. C\u00e1c \u0111\u1ec9nh cao n\u00ean n\u1ed5i b\u1eadt pha tr\u1ed9n th\u00e0nh c\u00e1c c\u1ea1nh m\u1edd. \u0110i\u1ec1u n\u00e0y g\u00e2y ra l\u1ed7i trong vi\u1ec7c ph\u00f9 h\u1ee3p v\u00e0 \u0111\u1ebfm \u0111\u1ec9nh cao. T\u1ec7 h\u01a1n n\u1eefa, m\u1ed9t ch\u1ee9c n\u0103ng d\u1ee5ng c\u1ee5 r\u1ed9ng tr\u1ed9n m\u1ed7i \u0111\u1ec9nh. Ngay c\u1ea3 s\u1ef1 thay \u0111\u1ed5i d\u01b0\u1edbi 0,1 mm \/ s - c\u00f3 v\u1ea5n \u0111\u1ec1 v\u1ec1 m\u1eb7t h\u00f3a h\u1ecdc - c\u00f3 th\u1ec3 v\u1eabn \u1ea9n.<\/p>\n

Trong ph\u1ed5 v\u1edbi \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ea5p, c\u00e1c \u0111\u1ec9nh t\u1eeb c\u00e1c \u0111\u1ecba \u0111i\u1ec3m s\u1eaft kh\u00e1c nhau ch\u1ed3ng ch\u00e9o. \u0110i\u1ec1u n\u00e0y che gi\u1ea5u s\u1ef1 kh\u00e1c bi\u1ec7t h\u00f3a h\u1ecdc th\u1ef1c s\u1ef1. V\u00ec v\u1eady, c\u00e1c m\u00e1y quang ph\u1ed5 c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao l\u00e0 r\u1ea5t quan tr\u1ecdng. H\u1ecd cho ph\u00e9p b\u1ea1n t\u00e1ch c\u00e1c b\u1ed9 ph\u1eadn n\u00e0y m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/p>\n

H\u00ecnh d\u1ea1ng \u0111\u01b0\u1eddng v\u00e0 \u0111\u1ed9 ph\u00e2n gi\u1ea3i \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng ph\u00e2n t\u00edch ph\u1ed5 ph\u1ee9c t\u1ea1p c\u1ee7a b\u1ea1n nh\u01b0 th\u1ebf n\u00e0o?<\/b><\/strong><\/h2>\n

Khi b\u1ea1n gi\u1ea3i ph\u00f3ng quang ph\u1ed5, h\u00ecnh d\u1ea1ng \u0111\u1ec9nh r\u1ea5t quan tr\u1ecdng. M\u00f4 h\u00ecnh h\u00f3a t\u1ed1t c\u1ee7a c\u00e1c h\u00ecnh d\u1ea1ng n\u00e0y l\u00e0 ch\u00eca kh\u00f3a. \u0110\u1ed9 ph\u00e2n gi\u1ea3i k\u00e9m bi\u1ebfn c\u00e1c h\u00ecnh d\u1ea1ng Lorentzian l\u00fd t\u01b0\u1edfng th\u00e0nh h\u00ecnh d\u1ea1ng gi\u1ea3 Voigt. Nh\u1eefng k\u1ebft h\u1ee3p m\u1edf r\u1ed9ng Gaussian t\u1eeb gi\u1edbi h\u1ea1n d\u1ee5ng c\u1ee5 v\u1edbi chi\u1ec1u r\u1ed9ng Lorentzian t\u1ef1 nhi\u00ean. Ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u0111\u1ec9nh r\u1ed9ng nh\u01b0 v\u1eady c\u1ea7n c\u00e1c thu\u1eadt to\u00e1n kh\u00f3 kh\u0103n. N\u00f3 c\u0169ng mang l\u1ea1i nhi\u1ec1u nghi ng\u1edd h\u01a1n cho c\u00e1c th\u00f4ng s\u1ed1 si\u00eau tinh t\u1ebf b\u1ea1n tr\u00edch xu\u1ea5t.<\/p>\n

\u0110\u1ed1i v\u1edbi c\u00e1c v\u1eadt li\u1ec7u c\u00f3 m\u1ed9t s\u1ed1 v\u1ecb tr\u00ed s\u1eaft - nh\u01b0 oxyt valence h\u1ed7n h\u1ee3p ho\u1eb7c c\u00e1c ch\u1ea5t x\u00fac t\u00e1c \u0111a d\u1ea1ng - \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ea5p l\u00e0 r\u1ee7i ro. B\u1ea1n c\u00f3 th\u1ec3 b\u1ecf qua ho\u1eb7c ph\u00e1t hi\u1ec7n sai m\u1ed9t s\u1ed1 giai \u0111o\u1ea1n. S\u1ef1 thay \u0111\u1ed5i isomer g\u1ea7n nhau c\u00f3 th\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m r\u1ed9ng r\u00e3i. \u0110i\u1ec1u n\u00e0y x\u00f3a b\u1ecf c\u01a1 h\u1ed9i c\u1ee7a b\u1ea1n \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c c\u00e0i \u0111\u1eb7t Fe kh\u00e1c nhau.<\/p>\n

Khi b\u1ea1n l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c v\u1eadt li\u1ec7u c\u1ee9ng nh\u01b0 kho\u00e1ng ch\u1ea5t silicate ho\u1eb7c enzyme d\u1ef1a tr\u00ean Fe, c\u00e1c h\u1ec7 th\u1ed1ng Mossbauer \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao l\u00e0 c\u1ea7n thi\u1ebft. Ch\u00fang gi\u00fap t\u00e1ch c\u00e1c ph\u00e2n ph\u1ed5 ch\u1ed3ng ch\u00e9o. V\u00e0 h\u1ecd cung c\u1ea5p k\u1ebft qu\u1ea3 \u0111\u1ecbnh l\u01b0\u1ee3ng ch\u00ednh x\u00e1c.<\/p>\n

Nh\u1eefng b\u01b0\u1edbc th\u1ef1c t\u1ebf b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u1ec3 c\u1ea3i thi\u1ec7n <\/b><\/strong>c\u1ee7a Mossbauer<\/b><\/strong>\u00a0\u0110\u1ed9 ph\u00e2n gi\u1ea3i quang ph\u1ed5?<\/b><\/strong><\/h2>\n

B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t v\u00e0i ph\u01b0\u01a1ng ph\u00e1p th\u1ef1c h\u00e0nh \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c ph\u1ed5 r\u00f5 r\u00e0ng h\u01a1n:<\/p>\n

\u0110\u1ed9 d\u00e0y c\u1ee7a b\u1ed9 h\u1ea5p th\u1ee5: Ch\u1ecdn b\u1ed9 h\u1ea5p th\u1ee5 m\u1ecfng. H\u1ecd gi\u1ea3m hi\u1ec7u \u1ee9ng b\u00e3o h\u00f2a v\u00e0 gi\u1eef \u0111\u1ed9 ph\u00e2n gi\u1ea3i m\u1ea1nh m\u1ebd. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng khi c\u00e1c trang web ch\u1ed3ng ch\u00e9o.<\/p>\n

Ho\u1ea1t \u0111\u1ed9ng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p: Nhi\u1ec7t g\u00e2y ra s\u1ef1 m\u1edf r\u1ed9ng Doppler t\u1eeb chuy\u1ec3n \u0111\u1ed9ng nguy\u00ean t\u1eed. Vi\u1ec7c \u0111o \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p l\u00e0m gi\u1ea3m \u0111i\u1ec1u n\u00e0y. Do \u0111\u00f3, \u0111\u1ed9 ph\u00e2n gi\u1ea3i s\u1ebd t\u1ed1t h\u01a1n.<\/p>\n

\u0110i\u1ec1u chu\u1ea9n t\u1ed1c \u0111\u1ed9: Ki\u1ec3m tra c\u00e1c ti\u00eau chu\u1ea9n nh\u01b0 l\u00e1 \u03b1-Fe th\u01b0\u1eddng xuy\u00ean. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7t t\u1ed1c \u0111\u1ed9 kh\u00f4ng ph\u1ea3i v\u00e0 s\u1eeda ch\u1eefa s\u1ef1 thay \u0111\u1ed5i h\u1ec7 th\u1ed1ng.<\/p>\n

S\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u1ec7 th\u1ed1ng: H\u00e3y \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng l\u00e1i v\u00e0 m\u00e1y d\u00f2 \u1ed5n \u0111\u1ecbnh theo th\u1eddi gian. \u0110i\u1ec1u n\u00e0y gi\u1eef cho d\u00f2ng c\u01a1 s\u1edf v\u1eefng ch\u1eafc trong qu\u00e1 tr\u00ecnh thu th\u1eadp d\u1eef li\u1ec7u d\u00e0i.<\/p>\n

M\u1ed9t quang ph\u1ed5 c\u1ea7n hi\u1ec7u chu\u1ea9n c\u1ea9n th\u1eadn, ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng, x\u00e1c nh\u1eadn ph\u01b0\u01a1ng ph\u00e1p v\u00e0 tr\u00ecnh \u0111\u1ed9. \u0110\u00e2y l\u00e0 nh\u1eefng c\u00f4ng c\u1ee5 c\u1ea7n thi\u1ebft cho ph\u00f2ng th\u00ed nghi\u1ec7m. \u0110i\u1ec1u t\u01b0\u01a1ng t\u1ef1 c\u0169ng \u0111\u00fang v\u1edbi thi\u1ebft b\u1ecb Mossbauer. Vi\u1ec7c hi\u1ec7u chu\u1ea9n v\u00e0 b\u1ea3o tr\u00ec th\u01b0\u1eddng xuy\u00ean l\u00e0 r\u1ea5t quan tr\u1ecdng cho d\u1eef li\u1ec7u ch\u1ea5t l\u01b0\u1ee3ng cao nh\u1ea5t.<\/p>\n

L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 PERSEE <\/b><\/strong>c\u1ee7a Mossbauer<\/b><\/strong>\u00a0H\u1ec7 th\u1ed1ng n\u00e2ng cao kh\u1ea3 n\u0103ng ph\u00e2n t\u00edch c\u1ee7a b\u1ea1n?<\/b><\/strong><\/h2>\n

 <\/p>\n

\"A3AFG\"<\/p>\n

 <\/p>\n

N\u1ebfu b\u1ea1n mu\u1ed1n thi\u1ebft b\u1ecb cung c\u1ea5p c\u01a1 h\u1ecdc r\u1eafn<\/b><\/u><\/strong><\/a>, ph\u1ed5 r\u00f5 r\u00e0ng, v\u00e0 ph\u00f9 h\u1ee3p \u0111\u01a1n gi\u1ea3n v\u1edbi th\u00f3i quen hi\u1ec7n t\u1ea1i c\u1ee7a b\u1ea1n, ki\u1ec3m tra ra M\u00e1y quang ph\u1ed5 Mossbauer MS500 c\u1ee7a PERSEE<\/a>. C\u00e1c \u0111\u01a1n v\u1ecb n\u00e0y c\u00f3 \u1ed5 \u0111\u0129a Doppler v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c nh\u1ecf micron. Ch\u00fang cung c\u1ea5p s\u1ef1 thay \u0111\u1ed5i t\u1ed1c \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u00e1c \u0111\u1ec9nh s\u1eafc n\u00e9t gi\u1eef ngay c\u1ea3 trong c\u00e1c chuy\u1ebfn ch\u1ea1y d\u00e0i.<\/p>\n

Ch\u00fang \u0111i k\u00e8m v\u1edbi b\u1ed9 l\u1ea1nh t\u00edch h\u1ee3p \u0111\u1ec3 \u0111o m\u00e1t. Ch\u00fang r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 c\u1eaft gi\u1ea3m s\u1ef1 m\u1edf r\u1ed9ng nhi\u1ec7t. Ngo\u00e0i ra, c\u00e1c m\u00f4-\u0111un t\u00edn hi\u1ec7u k\u1ef9 thu\u1eadt s\u1ed1 c\u00f3 c\u00e1c c\u00f4ng c\u1ee5 c\u1eaft ti\u1ebfng \u1ed3n th\u00f4ng minh. C\u00f9ng nhau, \u0111i\u1ec1u n\u00e0y cung c\u1ea5p ph\u1ed5 s\u1ea1ch v\u1edbi m\u1ee9c \u0111\u1ed9 t\u00edn hi\u1ec7u \u0111\u1ebfn ti\u1ebfng \u1ed3n m\u1ea1nh m\u1ebd. B\u1ea1n c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c thi\u1ebft l\u1eadp h\u00f3a h\u1ecdc nh\u1ecf r\u00f5 r\u00e0ng.<\/p>\n

\u0110\u1ec3 ph\u00e1t hi\u1ec7n, PERSEE<\/b><\/u><\/strong><\/a>\u00a0c\u00e1c c\u00f4ng c\u1ee5 s\u1eed d\u1ee5ng l\u1ea5p l\u00e1nh ho\u1eb7c c\u00e1c b\u1ed9 \u0111\u1ebfm t\u1ef7 l\u1ec7. Ch\u00fang \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp cho tia gamma 14,4 keV. Ch\u00fang nh\u1eafm \u0111\u1ebfn \u0111\u1ed9 s\u1eafc n\u00e9t n\u0103ng l\u01b0\u1ee3ng t\u1ed1t nh\u1ea5t.<\/p>\n

\u0110\u1ed9 ph\u00e2n gi\u1ea3i cao t\u1ea1o ra s\u1ef1 kh\u00e1c bi\u1ec7t h\u1eefu h\u00ecnh \u1edf \u0111\u00e2u<\/b><\/strong>\u00a0<\/b><\/strong>\u1ee9ng d\u1ee5ng<\/b><\/u><\/strong><\/a>?<\/b><\/strong><\/h2>\n

Vi\u1ec7c ph\u00e1t hi\u1ec7n Fe ^ 2 v\u00e0 Fe ^ 3 trong silicate ho\u1eb7c oxyt ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 kh\u00e1c bi\u1ec7t chuy\u1ec3n \u0111\u1ed5i \u0111\u1ed3ng v\u1ecb nh\u1ecf. Ph\u1ed5 quang Mossbauer \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao b\u1eaft \u0111\u01b0\u1ee3c nh\u1eefng \u0111i\u1ec1u n\u00e0y r\u00f5 r\u00e0ng. N\u1ebfu kh\u00f4ng c\u00f3 \u0111\u1ed9 s\u1eafc n\u00e9t \u0111\u00f3, nh\u00e3n giai \u0111o\u1ea1n trong kho\u00e1ng ch\u1ea5t c\u00f3 th\u1ec3 \u0111o\u00e1n ho\u1eb7c sai.<\/p>\n

Nghi\u00ean c\u1ee9u X\u00fac t\u00e1c<\/b><\/strong><\/h3>\n

C\u00e1c ch\u1ea5t x\u00fac t\u00e1c s\u1eaft chuy\u1ec3n qua c\u00e1c chu k\u1ef3 redox trong c\u00e1c ph\u1ea3n \u1ee9ng. \u0110\u1ec3 xem nh\u1eefng thay \u0111\u1ed5i n\u00e0y, b\u1ea1n c\u1ea7n c\u00e1c h\u1ec7 th\u1ed1ng Mossbauer c\u00f3 th\u1ec3 b\u1eaft \u0111\u01b0\u1ee3c nh\u1eefng chuy\u1ec3n \u0111\u1ed9ng quang ph\u1ed5 nh\u1ecf b\u00e9 theo th\u1eddi gian. D\u1eef li\u1ec7u s\u1eafc n\u00e9t cho ph\u00e9p b\u1ea1n theo d\u00f5i c\u00e1c thay \u0111\u1ed5i trang web c\u1ee7a Fe. Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 li\u00ean k\u1ebft ch\u00fang tr\u1ef1c ti\u1ebfp v\u1edbi vi\u1ec7c ch\u1ea5t x\u00fac t\u00e1c ho\u1ea1t \u0111\u1ed9ng t\u1ed1t nh\u01b0 th\u1ebf n\u00e0o.<\/p>\n

B\u1ea3n \u0111\u1ed3 giai \u0111o\u1ea1n luy\u1ec7n kim<\/b><\/strong><\/h3>\n

Trong c\u00e1c nghi\u00ean c\u1ee9u th\u00e9p, quang ph\u1ed5 Mossbauer ph\u00e1t hi\u1ec7n c\u00e1c giai \u0111o\u1ea1n nh\u01b0 martensit, bainite ho\u1eb7c austenit. N\u00f3 l\u00e0m \u0111i\u1ec1u n\u00e0y th\u00f4ng qua c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m si\u00eau tinh t\u1ebf \u0111\u1ed9c \u0111\u00e1o c\u1ee7a h\u1ecd. N\u1ebfu m\u00e1y quang ph\u1ed5 c\u1ee7a b\u1ea1n b\u1ecf l\u1ee1 \u0111\u1ed9 ph\u00e2n gi\u1ea3i, c\u00e1c giai \u0111o\u1ea1n n\u00e0y tr\u00f4ng gi\u1ed1ng nhau. \u0110i\u1ec1u n\u00e0y l\u00e0m t\u1ed5n th\u01b0\u01a1ng k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u v\u00e0 ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n

B\u1ea1n n\u00ean ch\u1ecdn h\u1ec7 th\u1ed1ng PERSEE n\u00e0o d\u1ef1a tr\u00ean nhu c\u1ea7u ph\u00e2n t\u00edch c\u1ee7a b\u1ea1n?<\/b><\/strong><\/h2>\n

\u0110\u1ed1i v\u1edbi ki\u1ec3m tra tr\u1ea1ng th\u00e1i oxy h\u00f3a c\u01a1 b\u1ea3n ho\u1eb7c m\u1eabu \u0111\u01a1n v\u1ecb, thi\u1ebft l\u1eadp kh\u1edfi \u0111\u1ed9ng ho\u1ea1t \u0111\u1ed9ng t\u1ed1t. N\u00f3 mang l\u1ea1i k\u1ebft qu\u1ea3 \u1ed5n \u0111\u1ecbnh v\u1edbi gi\u00e1 c\u00f4ng b\u1eb1ng. Nh\u01b0ng \u0111\u1ec3 chia nhi\u1ec1u trang web ho\u1eb7c theo d\u00f5i thay \u0111\u1ed5i giai \u0111o\u1ea1n v\u1edbi nhi\u1ec7t \u0111\u1ed9, h\u00e3y S\u1ea3n ph\u1ea9m PERSEE MS500-HR<\/a>. N\u00f3 cung c\u1ea5p \u0111\u1ed9 ph\u00e2n gi\u1ea3i h\u00e0ng \u0111\u1ea7u cho c\u00f4ng vi\u1ec7c v\u1eadt li\u1ec7u kh\u00f3 kh\u0103n.<\/p>\n

C\u00e1c c\u00f4ng c\u1ee5 n\u00e0y li\u00ean k\u1ebft d\u1ec5 d\u00e0ng v\u1edbi ph\u1ea7n m\u1ec1m nh\u01b0 MossWinn ho\u1eb7c Recoil. \u0110i\u1ec1u n\u00e0y l\u00e0m cho vi\u1ec7c x\u1eed l\u00fd d\u1eef li\u1ec7u tr\u01a1n tru v\u00e0 c\u00f3 th\u1ec3 l\u1eb7p l\u1ea1i. Cho d\u00f9 b\u1ea1n c\u1ea7n ki\u1ec3m tra nhanh ch\u00f3ng ho\u1eb7c nghi\u00ean c\u1ee9u s\u00e2u s\u1eafc, m\u1ed9t thi\u1ebft l\u1eadp ph\u00f9 h\u1ee3p v\u1edbi m\u1ee5c ti\u00eau c\u1ee7a b\u1ea1n.<\/p>\n

C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/b><\/strong><\/h3>\n

Q: C\u00f3 th\u1ec3<\/b><\/strong>\u00a0<\/b><\/strong>T\u00f4i ph\u00e2n t\u00edch nhi\u1ec1u tr\u1ea1ng th\u00e1i oxy h\u00f3a s\u1eaft trong m\u1ed9t ph\u1ed5 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u00e1y \u0111o ph\u1ed5 mossbauer?<\/b><\/strong>
\n<\/b><\/strong>A: V\u00e2ng, nh\u01b0ng ch\u1ec9 n\u1ebfu thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i \u0111\u1ee7 \u0111\u1ec3 t\u00e1ch bi\u1ec7t s\u1ef1 thay \u0111\u1ed5i isomer ch\u1ed3ng ch\u00e9o. N\u1ebfu kh\u00f4ng c\u00f3 n\u00f3, m\u00f4i tr\u01b0\u1eddng Fe^2 v\u00e0 Fe^3 c\u00f3 th\u1ec3 h\u1ed7n h\u1ee3p v\u1edbi nhau.<\/p>\n

 <\/p>\n

Q: T\u1ea1i sao t\u00f4i c\u1ea7n nhi\u1ec7t \u0111\u1ed9 th\u1ea5p cho m\u1ed9t s\u1ed1 <\/b><\/strong>c\u1ee7a Mossbauer<\/b><\/strong>\u00a0\u0111o l\u01b0\u1eddng?<\/b><\/strong>
\nA: Nhi\u1ec7t \u0111\u1ed9 th\u1ea5p l\u00e0m gi\u1ea3m s\u1ef1 m\u1edf r\u1ed9ng Doppler g\u00e2y ra b\u1edfi chuy\u1ec3n \u0111\u1ed9ng nguy\u00ean t\u1eed, c\u1ea3i thi\u1ec7n \u0111\u1ed9 ph\u00e2n gi\u1ea3i v\u00e0 cho ph\u00e9p ph\u00e1t hi\u1ec7n c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ph\u1ed5 tinh t\u1ebf.<\/p>\n

 <\/p>\n

Q: T\u00f4i n\u00ean hi\u1ec7u chu\u1ea9n bao nhi\u00eau l\u1ea7n <\/b><\/strong>c\u1ee7a Mossbauer<\/b><\/strong>\u00a0h\u1ec7 th\u1ed1ng?<\/b><\/strong>
\n<\/b><\/strong>A: Vi\u1ec7c hi\u1ec7u chu\u1ea9n th\u01b0\u1eddng xuy\u00ean b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng l\u00e1 \u03b1-Fe ho\u1eb7c ti\u00eau chu\u1ea9n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb tr\u01b0\u1edbc m\u1ed7i phi\u00ean \u0111o l\u01b0\u1eddng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c trong quy m\u00f4 t\u1ed1c \u0111\u1ed9 v\u00e0 g\u00e1n \u0111\u1ec9nh.<\/p>","protected":false},"excerpt":{"rendered":"

Mossbauer spectroscopy uses the recoil-free emission and absorption of gamma rays to study hyperfine interactions. One key example is the isomer shift. This shift shows the local electronic surroundings of nuclei like ^57Fe. The precision in measuring the isomer shift is vital. It helps identify oxidation states and chemical bonds. This precision depends on the\u00a0spectrometer‘s […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[38,37],"tags":[],"class_list":["post-4204","post","type-post","status-publish","format-standard","hentry","category-industry-information","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/posts\/4204","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/comments?post=4204"}],"version-history":[{"count":4,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/posts\/4204\/revisions"}],"predecessor-version":[{"id":4212,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/posts\/4204\/revisions\/4212"}],"wp:attachment":[{"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/media?parent=4204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/categories?post=4204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pgeneral.com\/vi\/wp-json\/wp\/v2\/tags?post=4204"}],"curies":[{"name":"WP","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}