1 / 43

XAFS

yaholo
Download Presentation

XAFS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. XAFS??? ????????????? ????????? ?? ??

    2. XAFS??????? ???·XAFS??? Ti K?(4.96keV) Cs LIII?(5.01keV) Ba LIII?(5.24keV) k~8.6A-1 ????????

    3. ??? · XAFS???????? ???????????????????????????????????? I0 = IIN {1-exp(-m0x0)} I = (IIN-I0) exp (-mSX) mt = ln(I0/I) = ln {1-exp(-m0x0)} + m0x0 +mSX ???????????????????

    4. XAFS??c

    5. ??????? I0????? (mx)0 = 0.245 ????? mX=2.55 ?S/N??? S/N = 0.556 DmA/m (IIN)1/2 DmA : XAFS???? m : ?????? IIN : ????? I????? 0.9~<1

    6. X????????? ????????S/N???????yes ??????????????????????(KMnO4????…) ?????????????S/N???????(?????????…)

    7. ??????? ????????? · ???????mt?????4???? ????????ecl<4??? ?????????( Dmt)????????? (<2) Dmt~3 ???? 2V ? ???? 0.1V ????dynamic range ????????????????????

    8. ??????? I/I0 = exp(-mMrx) = exp(-mx) mM : ?????? (cm2/g) m : ????? (cm-1) r : ?? (gcm-3) x : ????? (cm) mM = S mMi Wi =Cl3?Dl4 0.1mol dm-3?Cu?????

    9. ????? ????????????? ????

    10. X??????????

    11. ??? 2d sin q = nl (n = 1, 2, 3…) ?????? ?????? a:1×10-1?b: 2×10-3?c: 6×10-5 <10-4 ???? a: Ti(5mm) + Al(30mm) b,c : Ti(5mm) + Al(60mm)

    12. glitch ?????????????I0???????????? · ??????????????????????? · ???????????? · ???????? · ????? ???????????? ??????????

    13. ?????(1) ?????? ???

    14. ?????(2) ?????? ???

    15. ???????

    16. ??????????? ?????????????????? ????10-4???????? ????????X?????????? ????????????????

    17. ?????? ??? ?????? ?????? wt%

    18. ??? ??X?????X???????????? ??? ???????????? ??????????

    19. ???????? [??] ????????????????? ????? eW/8p > mA/mT e~0.5 (Ga)? W/4p ~0.15 0.3wt%?Cu/SiO2 0.02 mol dm -3?Cu aq.

    20. ???(??????)

    21. ??XAFS???? Lytle detector

    22. ??????(SSD) ?????????????? ???????? S/N = S/(S+B)1/2, S/B~1/200 ??X????X???????

    23. ???????(CEY)

    24. ?X??????? ??????? ??? : ???????????????? ??????????Photo Diode ??? : ????????S/B??? Photo Diode?PC?SSD ???????? ?????(AEY/PEY/TEY):???????????? CEM?EM???????

    25. ?X???????

    26. ????CEY?

    27. ???? ?????? ?X????? · ???/He????/??? · ???/???(~10K) ????????? ??(?????????????) ??????(???) ???? ???????(SPring-8) ????? ?????? ????(??He) ???(?????????????DAC????..) ??????/??????? in -situ??? ??????(s~ms)

    28. XAFS???? In one trip to the synchrotron we collected more and better data in three days than in the previous ten years.(F.W. Lytle, J. Synchrotron Rad., 6, 123 (1999)) ????????

    29. ?????

    30. ???????

    31. ???????XAFS??

    32. ?????????

    33. ?????? ????? ????? ????? ????? ??????????

    34. ??????? ????(???????) ???? ???? ??? ???????

    35. ?????? Bragg?? 2d sin q = nl n=1 ??? n>1 ??????? ??????????? E l = hc = 12398.52 [eV A]

    36. ???????? ????????

    37. ??? ??/??????? 1m????????? ??:Si???????????? ??:Rh?Pt?Ni... ????? ????????????

    38. ???·??? ??? X?????????? ??????? ?????????????????????

    39. Photon Factory

    41. ????XAFS?? Advantage 1. ??????????????(?????????) 2. ???????? 3. ???? 4. ????????????? 5. ??? Disadvantage 1. X???????????????? 2. ??????????? 3. ????? 4. ??? 5. ?????????? [??????XAFS???] ·1920??????????????????????????????????????????????????????1970???????????????????????XAFS?????????????????????????????????????????in-laboratory????????XAFS????????????????????????? ·Photon Factory?Spring-8??????????????????????????????????????????????????????????????????????????????XAFS????????? ·???????????????????????????????????????????????????????????????????????????????????????????????XAFS?????????????????????????????????? [??????XAFS???] ·1920??????????????????????????????????????????????????????1970???????????????????????XAFS?????????????????????????????????????????in-laboratory????????XAFS????????????????????????? ·Photon Factory?Spring-8??????????????????????????????????????????????????????????????????????????????XAFS????????? ·???????????????????????????????????????????????????????????????????????????????????????????????XAFS??????????????????????????????????

    42. [XAFS??????] ·??????????????????????????????????????????????????? ·??????????????????????????????????????????????????????????????????????????????????? [XAFS??????] ·??????????????????????????????????????????????????? ·???????????????????????????????????????????????????????????????????????????????????

    43. ??XAFS????? ??????? 5 ~ 25keV ????????????????????(>20keV)???????????????? ???? 1??~1? ??????1?????????????????????????????????????????1??????????????????????????????? ???? 0.1wt%??? ??????????????????????????????????? ?????5mM?FeCl3????XAFS?????????????

    44. ???????? ???????? ????????

More Related