Energy transfer of highly vibrationally excited naphthalene. II. Vibrational energy dependence and isotope and mass effects

Abstract

The vibrational energy dependence, H and D atom isotope effects, and the mass effects in the energy transfer between rare gas atoms and highly vibrationally excited naphthalene in the triplet state were investigated using crossed-beam/time-sliced velocity-map ion imaging at various translational collision energies. Increase of vibrational energy from 16 194 to 18 922 cm(-1) does not make a significant difference in energy transfer. The energy transfer properties also remain the same when H atoms in naphthalene are replaced by D atoms, indicating that the high vibrational frequency modes do not play important roles in energy transfer. They are not important in supercollisions either. However, as the Kr atoms are replaced by Xe atoms, the shapes of energy transfer probability density functions change. The probabilities for large translation to vibration/rotation energy transfer (T-->VR) and large vibration to translation energy transfer (V-->T) decrease. High energy tails in the backward scatterings disappear, and the probability for very large vibration to translation energy transfer such as supercollisions also decreases.

Energy transfer of highly vibrationally excited 2-methylnaphthalene: Methylation effects

“…[30][31][32] Only a brief description is described here. Electronic mail: ckni@po.iams.sinica.edu.tw.…”

A unified model for simulating liquid and gas phase, intermolecular energy transfer: N2 + C6F6 collisions

“…55 The same time-resolved UV absorption spectroscopy was used for studying collisional relaxation of benzene 56 and hexafluorobenzene. [57][58][59] Recently, Ni et al have used a molecular beam apparatus with a time-sliced velocity map ion imaging technique to study collisional energy transfer from azulene, 60 and naphthalene [61][62][63][64] and its derivatives, 65 in collisions with monoatomic [60][61][62][63]65 as well as polyatomic 64 bath gases. Several other experimental techniques have also been used, namely, kinetically controlled selective ionization (KCSI) detection, 66,67 infrared multiphoton absorption (IRMPA) coupled with time resolved infrared fluoresence (IRF), [68][69][70] and supersonic free jet expansion.…”

Full State-Resolved Energy Gain Profiles of CO2 from Collisions with Highly Vibrationally Excited Molecules. II. Energy-Dependent Pyrazine (E = 32 700 and 37 900 cm–1) Relaxation

“…The energy dependence of collisional relaxation in highly vibrationally excited molecules has important consequences for the redistribution of energy in high energy environments and impacts the availability of internal energy for chemical reactions. − Information about collisional relaxation of highly excited molecules comes from a number of experimental and theoretical approaches, but truly predictive models do not yet exist. − Unimolecular reactions that take place over deep potential energy wells are particularly sensitive to the distribution for energy transfer events . The interplay between the limiting cases of strong and weak collisions, which is at the heart of the collisional deactivation process, has long been recognized as a key component of the overall relaxation process.…”