Autoregressive vibrational-dephasing analysis of the ν2 band of liquid methyl iodide in nanoporous glass

Tracy R. Bryans; Richard E. Wilde; Mark W. Holtz; Edward L. Quitevis

doi:10.1016/S0009-2614(99)01184-7

Autoregressive vibrational-dephasing analysis of the ν₂ band of liquid methyl iodide in nanoporous glass

Tracy R. Bryans, Richard E. Wilde, Mark W. Holtz, Edward L. Quitevis

Chemistry and Biochemistry

Research output: Contribution to journal › Article › peer-review

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Abstract

The spontaneous Raman spectrum of the ν₂ methyl-deformation mode of liquid methyl iodide confined in 50-Å-diameter pores of silica sol-gel glass was measured at room temperature. The ν₂ band was broader for the microconfined liquid than for the bulk liquid. Vibrational correlation functions obtained by Fourier transforming the isotropic bands were modeled by using a memory-function procedure based on the Zwanzig-Mori formalism. The memory functions were analyzed by stochastic time series using an autoregressive model. Based on this analysis, the increase in the line width is largely attributed to inhomogeneous broadening due to site inhomogeneities at the pore surface.

Original language	English
Pages (from-to)	459-464
Number of pages	6
Journal	Chemical Physics Letters
Volume	314
Issue number	5-6
DOIs	https://doi.org/10.1016/S0009-2614(99)01184-7
State	Published - Dec 10 1999

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@article{52a6437b3298473189e5e24e19fd018d,

title = "Autoregressive vibrational-dephasing analysis of the ν2 band of liquid methyl iodide in nanoporous glass",

abstract = "The spontaneous Raman spectrum of the ν2 methyl-deformation mode of liquid methyl iodide confined in 50-{\AA}-diameter pores of silica sol-gel glass was measured at room temperature. The ν2 band was broader for the microconfined liquid than for the bulk liquid. Vibrational correlation functions obtained by Fourier transforming the isotropic bands were modeled by using a memory-function procedure based on the Zwanzig-Mori formalism. The memory functions were analyzed by stochastic time series using an autoregressive model. Based on this analysis, the increase in the line width is largely attributed to inhomogeneous broadening due to site inhomogeneities at the pore surface.",

author = "Bryans, {Tracy R.} and Wilde, {Richard E.} and Holtz, {Mark W.} and Quitevis, {Edward L.}",

note = "Funding Information: This work was supported by grants from the Texas Higher Education Coordinating Board through the Advanced Research Program (003644-057) and the Robert A. Welch Foundation (D-1019). We thank Prof. D. Casadonte for the use of the NOVA 1000 in carrying out the BET measurements.",

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doi = "10.1016/S0009-2614(99)01184-7",

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journal = "Chemical Physics Letters",

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T1 - Autoregressive vibrational-dephasing analysis of the ν2 band of liquid methyl iodide in nanoporous glass

AU - Bryans, Tracy R.

AU - Wilde, Richard E.

AU - Holtz, Mark W.

AU - Quitevis, Edward L.

N1 - Funding Information: This work was supported by grants from the Texas Higher Education Coordinating Board through the Advanced Research Program (003644-057) and the Robert A. Welch Foundation (D-1019). We thank Prof. D. Casadonte for the use of the NOVA 1000 in carrying out the BET measurements.

PY - 1999/12/10

Y1 - 1999/12/10

N2 - The spontaneous Raman spectrum of the ν2 methyl-deformation mode of liquid methyl iodide confined in 50-Å-diameter pores of silica sol-gel glass was measured at room temperature. The ν2 band was broader for the microconfined liquid than for the bulk liquid. Vibrational correlation functions obtained by Fourier transforming the isotropic bands were modeled by using a memory-function procedure based on the Zwanzig-Mori formalism. The memory functions were analyzed by stochastic time series using an autoregressive model. Based on this analysis, the increase in the line width is largely attributed to inhomogeneous broadening due to site inhomogeneities at the pore surface.

AB - The spontaneous Raman spectrum of the ν2 methyl-deformation mode of liquid methyl iodide confined in 50-Å-diameter pores of silica sol-gel glass was measured at room temperature. The ν2 band was broader for the microconfined liquid than for the bulk liquid. Vibrational correlation functions obtained by Fourier transforming the isotropic bands were modeled by using a memory-function procedure based on the Zwanzig-Mori formalism. The memory functions were analyzed by stochastic time series using an autoregressive model. Based on this analysis, the increase in the line width is largely attributed to inhomogeneous broadening due to site inhomogeneities at the pore surface.

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U2 - 10.1016/S0009-2614(99)01184-7

DO - 10.1016/S0009-2614(99)01184-7

M3 - Article

AN - SCOPUS:0005002448

SN - 0009-2614

VL - 314

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EP - 464

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 5-6

ER -

Autoregressive vibrational-dephasing analysis of the ν₂ band of liquid methyl iodide in nanoporous glass

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