IR excitation of ethylene molecules and clusters embedded in He-4 droplets

Citation
M. Kunze et al., IR excitation of ethylene molecules and clusters embedded in He-4 droplets, J CHEM PHYS, 114(21), 2001, pp. 9463-9469
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF CHEMICAL PHYSICS
ISSN journal
0021-9606 → ACNP
Volume
114
Issue
21
Year of publication
2001
Pages
9463 - 9469
Database
ISI
SICI code
0021-9606(20010601)114:21<9463:IEOEMA>2.0.ZU;2-F
Abstract
Ethylene and ethylene clusters embedded in superfluid He-4 droplets have be en spectroscopically investigated with continuous wave line tunable CO2 and N2O lasers, utilizing the strong absorption of the nu (7) mode of C2H4. Th e monomer and the different clusters of ethylene absorb in the same spectra l region and show significant overlap of their spectra. By measuring the de pendence of the signal on the pick-up pressure and fitting the resulting cu rves with a Poisson distribution and by further studying the spectral depen dence on the droplet size, it was possible to assign two peaks. The origin of the 10 cm(-1) broad gas phase dimer spectrum has been the subject of muc h discussion; we show that the broad peak is not due to homogeneous broaden ing, because the low temperature of the He droplet leads to a dimer full wi dth at half maximum width of about 1 cm(-1). (C) 2001 American Institute of Physics.