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Vibrational population lifetimes of OH(v = 1) in natural crystalline micas

✍ Scribed by E.J. Heilwell

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 686 KB
Volume: 129
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80166-x

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✦ Synopsis

Picosecond infrared saturation-recovery measurements have been performed on the OH-stretching vibrations (3500-3710 cm-l) of hydroxyl groups located within the octahedral layers of ten naturally occurring crystalline micas. At room temperature, the average OH(u = 1) vibrational population lifetime (T, f u) for OH-in muscovite is 92 f 13 ps. For biotite samples, absorptions arising from two disti.nct lattice sites yield Z', = 221 f 23 and 87 f 33 ps, respectively. Crystal structures, hydroxyl orientation and hydrogen bonding, ionic environment and infrared spectroscopy of these mineral families are used to rationalize the observed relaxation times.

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