2012
DOI: 10.1088/1674-1137/36/2/015
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Development of pressure-modulated EXAFS method

Abstract: Many modulation techniques have been widely applied to improve the quality of conventional spectra. Here a pressure-modulated EXAFS method is proposed to detect the small changes of local structure induced by the modulation of high pressure. In the experiment a dynamic diamond anvil cell was used to put a periodic load on the sample and lock-in amplifier to measure the modulated EXAFS signals. We have applied this technique to ZnSe and revealed a sensitivity to atomic displacement of 0.1 pm that is about ten t… Show more

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Cited by 4 publications
(5 citation statements)
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“…The most important characteristic of the demodulated spectrum is a $ 90 phase difference compared with the original spectrum. As simulated in former research (Ko ¨nig et al, 2012), the differential spectrum has no phase difference when coordination number and disorder changes, while 90 phase difference is typically observed if the bond length changes (Chu et al, 2012). Thus, the change in bond length may be the most important factor.…”
Section: Quantitative Analysis Of Demodulated Spectramentioning
confidence: 71%
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“…The most important characteristic of the demodulated spectrum is a $ 90 phase difference compared with the original spectrum. As simulated in former research (Ko ¨nig et al, 2012), the differential spectrum has no phase difference when coordination number and disorder changes, while 90 phase difference is typically observed if the bond length changes (Chu et al, 2012). Thus, the change in bond length may be the most important factor.…”
Section: Quantitative Analysis Of Demodulated Spectramentioning
confidence: 71%
“…For higher accuracy, the value of ! should be smaller, as in experiments with fast response such as high pressure (Chu et al, 2012), magnetostriction (Ruffoni et al, 2008), etc.…”
Section: Relationship Between Psd and Difference Spectrummentioning
confidence: 99%
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“…In this study, Sunhe River was selected as the research 1 subject for urban river ecological restoration. Through the comprehensive technology of artificial aeration [9], artificial floating island [10,11] and microbial agents [12] (O-AFI-MA), the effect and influence of the O-AFI-MA on Black and odorous Water Body treatment were investigated.…”
Section: Introductionmentioning
confidence: 99%
“…Recently, it has been applied in XAFS experiments [6−10]. A periodic external perturbation, such as light [6], magnetic field [7], temperature [8], or high pressure [9,10], has been verified to enhance the XAFS signal of internal structure. In 2001, an energymodulation technique [11] for XAFS spectroscopy was first developed where another monochromator together with a piezo-driven oscillation stage were added to the beamline and used to modulate the energy.…”
Section: Introductionmentioning
confidence: 99%