کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1249859 | 970743 | 2006 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Intramolecular dynamics from frequency domain spectroscopy Intramolecular dynamics from frequency domain spectroscopy](/preview/png/1249859.png)
Vibrationally mediated photodissociation is emerging as a useful tool for studies of intramolecular dynamics in polyatomic molecules since it is a sensitive indicator of both the vibrational and electronic dynamics. The method involves energy deposition in skeletal motions of molecules, their subsequent promotion to excited electronic states and dissociation. Jet-cooled action spectra, reflecting the yield of the ensuing atomic fragments as a function of vibrational excitation, are compared to simultaneously measured room temperature photoacoustic spectra and simulated spectra. The narrowed action spectra expose resonance splitting and enable estimating the homogeneous broadening and thus time scales for intramolecular vibrational energy redistribution to close resonating states and to bath states. Overtone spectra of the acetylenic and alkyl CH stretches of the acetylene homologues, propyne and 1-butyne, demonstrate how the nature of rovibrationally excited states is highlighted by photolysis of pre-excited molecules.
Journal: Vibrational Spectroscopy - Volume 42, Issue 1, 18 October 2006, Pages 147–155