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Australian Centre for Neutron Sciences, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW, 2232 Australia. Recent advances in linear and nonlinear Raman spectroscopy. Grüneisen parameters obtained from our own analysis of the SC phase are also given. Experimental Raman spectra of formaldehyde in the 400–860 K temperature range. These three fundamental transitions also should be Raman active.We would expect to observe three strong peaks in the IR and three strong peaks in the Raman at the same frequency as in the IR. / Proctor, J. E.; Maynard-Casely, H. E.; Hakeem, M. A.; Cantiah, D. Research output: Contribution to journal › Article › peer-review, T1 - Raman spectroscopy of methane (CH4) to 165 GPa, T2 - Effect of structural changes on Raman spectra. abstract = "We have conducted a Raman study of methane (CH4), a major constituent of the outer planets, at pressures up to 165 GPa. Table S2. “Synthetic” spectra as sum of Gaussian curves to match experimental spectra. Values of mode Grüneisen parameters obtained from analysis of Raman data in ref. Search text. 1(a) shows the room temperature spectra of methane, ethylene, ethane, and DME, obtained with the spectrometer of Ref. The predicted dissociation of methane at ultrahigh pressure to form C2H6 and H2 is not observed, but an additional discontinuous change in the pressure-induced shift of the Raman peaks is observed at 110 GPa. Applications of Raman spectroscopy for trace gas analysis, however, have not found widespread use so far due to the inherent weakness of Raman transitions and are thus mainly employed in condensed phases. o thus the active mode must be the A1 symmetric bend. title = "Raman spectroscopy of methane (CH4) to 165 GPa: Effect of structural changes on Raman spectra". Proctor, J. E., Maynard-Casely, H. E., Hakeem, M. A., & Cantiah, D. (2017). Alternatively, use our A–Z index We observe splitting of the principal Raman-active vibrational mode above 45 GPa and a nonlinear dependence of Raman peak position on pressure. Error bars on plots (a) and (c) are negligible. Dotted lines show the pressure dependence of the ν1 and ν3 vibron peak positions found in ref. [9], for the pressure range 0–20 GPa. Arrows mark the pressure range in which we believe the phase transition from the SC to cHP phase occurs in our work. Raman spectroscopy of methane (CH4) to 165 GPa : Effect of structural changes on Raman spectra. The Grüneisen parameters for the principal Raman-active modes of methane in the simple cubic and high-pressure cubic phases are calculated. Figure S3. (a) ν1 (1) Raman mode in the range 15–70 GPa. This capability will greatly extend the range of applicability of Raman measurements in combustion applications. We have conducted a Raman study of methane (CH4), a major constituent of the outer planets, at pressures up to 165 GPa. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Raman spectra of methane, ethylene, ethane, dimethyl ether, formaldehyde and propane for combustion applications, Journal of Quantitative Spectroscopy and Radiative Transfer, https://doi.org/10.1016/j.jqsrt.2015.04.018. We observe splitting of the principal Raman‐active vibrational mode above 45 GPa and a nonlinear dependence of Raman peak position on pressure. Proctor JE, Maynard-Casely HE, Hakeem MA, Cantiah D. Proctor, J. E. ; Maynard-Casely, H. E. ; Hakeem, M. A. ; Cantiah, D. /. for methane in the SC phase. Figure S2. By continuing you agree to the use of cookies. Continuing professional development courses, University institutions Open to the public. This does not; however mean that they can be observed. 1. in the Raman spectrum can be used for conclusive identification of single compounds or of individual components in mixtures. We observe splitting of the principal Raman-active vibrational mode above 45 GPa and a nonlinear dependence of Raman peak position on pressure. Raman high-pressure study of butane isomers up to 40 GPa. The Grüneisen parameters for the principal Raman-active modes of methane in the simple cubic and high-pressure cubic phases are calculated.

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