Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 127, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2764077
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Energy transfer between highly vibrationally excited naphthalene and Kr atom in a series of translational collision energies (108-847 cm(-1)) was studied separately using a crossed-beam apparatus along with time-sliced velocity map ion imaging techniques. Highly vibrationally excited naphthalene in the triplet state (vibrational energy: 16 194 cm(-1); electronic energy: 21 400 cm(-1)) was formed via the rapid intersystem crossing of naphthalene initially excited to the S-2 state by 266 nm photons. The collisional energy transfer probability density functions were measured directly from the scattering results of highly vibrationally excited naphthalene. At low collision energies a short-lived naphthalene-Kr complex was observed, resulting in small amounts of translational to vibrational-rotational (T -> VR) energy transfer. The complex formation probability decreases as the collision energy increases. T -> VR energy transfer was found to be quite efficient at all collision energies. In some instances, nearly all of the translational energy is transferred to vibrational-rotational energy. On the other hand, only a small fraction of vibrational energy is converted to translational energy. The translational energy gained from vibrational energy extend to large energy transfer (up to 3000 cm(-1)) as the collision energy increases to 847 cm(-1). Substantial amounts of large V -> T energy transfer were observed in the forward and backward directions at large collision energies.
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