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Alkylation Effects on the Energy Transfer of Highly Vibrationally Excited Naphthalene
Author(s) -
Hsu Hsu Chen,
Tsai MingTsang,
Dyakov Yuri A.,
Ni ChiKung
Publication year - 2011
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201100314
Subject(s) - excited state , naphthalene , alkyl , chemistry , atomic physics , rotational energy , krypton , energy transfer , range (aeronautics) , scattering , photochemistry , molecular physics , materials science , xenon , physics , organic chemistry , optics , composite material
The energy transfer of highly vibrationally excited isomers of dimethylnaphthalene and 2‐ethylnaphthalene in collisions with krypton were investigated using crossed molecular beam/time‐of‐flight mass spectrometer/time‐sliced velocity map ion imaging techniques at a collision energy of approximately 300 cm −1 . Angular‐resolved energy‐transfer distribution functions were obtained directly from the images of inelastic scattering. The results show that alkyl‐substituted naphthalenes transfer more vibrational energy to translational energy than unsubstituted naphthalene. Alkylation enhances the V→T energy transfer in the range −Δ E d =−100∼−1500 cm −1 by approximately a factor of 2. However, the maximum values of V→T energy transfer for alkyl‐substituted naphthalenes are about 1500∼2000 cm −1 , which is similar to that of naphthalene. The lack of rotation‐like wide‐angle motion of the aromatic ring and no enhancement in very large V→T energy transfer, like supercollisions, indicates that very large V→T energy transfer requires special vibrational motions. This transfer cannot be achieved by the low‐frequency vibrational motions of alkyl groups.