Femtosecond Optical Kerr Effect Studies of Liquid Methyl Iodide

Autor:	Edward L. Quitevis, Manickam Neelakandan
Rok vydání:	1996
Předmět:	Kerr effect General Engineering Time constant Analytical chemistry chemistry.chemical_compound symbols.namesake Fourier transform chemistry Polarizability Femtosecond symbols Physical and Theoretical Chemistry Atomic physics Anisotropy Spectroscopy Methyl iodide
Zdroj:	The Journal of Physical Chemistry. 100:10005-10014
ISSN:	1541-5740 0022-3654
DOI:	10.1021/jp953700c
Popis:	The collective polarizability anisotropy dynamics of liquid methyl iodide at room temperature and ambient pressure was studied by using optical heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES) with 45 fs laser pulses. The OHD-RIKES data are analyzed by using both the model-dependent approach, which assumes four distinct temporal responses, and the model-independent Fourier transform approach, which generates a spectral density. Near zero time, the OHD-RIKES transient is dominated by the instantaneous electronic response. The short-time nuclear response is characterized by two components. The first component is interpreted as arising from an inhomogeneously broadened (fwhm ≈ 62 cm-1) underdamped intermolecular vibrational mode with a mean frequency of ∼60 cm-1. The second component is an intermediate quasi-exponential response with a 1/e time constant of ∼200 fs. At longer times, the OHD-RIKES transient decays exponentially with a 1/e time constant of 1.76 ± 0.05 ps, which corresponds...
Databáze:	OpenAIRE
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