Infrared photodissociation of van der Waals molecules containing ethylene

Journal Article · Fri May 01 04:00:00 EDT 1981 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.441712· OSTI ID:6535894

Casassa, M P; Bomse, D S; Janda, K C

Vibrational predissociation line shapes in the n/sub 7/ region of the ethylene spectrum are measured for van der Waals molecules of ethylene bound to Ne, Ar, Kr, C/sub 2/H/sub 4/, C/sub 2/F/sub 4/, and larger ethylene clusters. The predissociative rate is very fast for this group of molecules. The vibrationally excited state lifetimes are 0.44, 0.59 and 0.89 x 10/sup -12/ sec for (C/sub 2/H/sub 4/)/sub 2/, ArxC/sub 2/H/sub 4/, and C/sub 2/H/sub 4/xC/sub 2/F/sub 4/ respectively. That the observed line shapes are homogeneous is demonstrated by the fact that a low-power, narrow frequency bandwidth laser can dissociate a large fraction of the initial ensemble of ethylene clusters. The observed transition probability is proportional to the number of ethylene subunits for clusters containing three or fewer ethylene subunits. These observations are interpreted in terms of intramolecular energy flow directly from ethylene n/sub 7/ to the weak van der Waals modes of motion.

• Research Organization: Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
• OSTI ID: 6535894
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ALKENES
ARGON
BEAMS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DISSOCIATION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ETHYLENE
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INFORMATION
INFRARED RADIATION
KRYPTON
LIFETIME
LINE WIDTHS
MOLECULAR BEAMS
NEON
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PREDISSOCIATION
RADIATIONS
RARE GASES
VAN DER WAALS FORCES
VIBRATIONAL STATES