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Reaction of Sr with CH 2 Cl 2 , CHCl 3 , and CCl 4 ; Laser‐Induced Fluorescence Studies on Relaxed and Unrelaxed SrCl
Author(s) -
Keuzer Freek,
Bulthuis Jaap,
Stolte Steven
Publication year - 1994
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199400012
Subject(s) - chemistry , analytical chemistry (journal) , chemical reaction , population , molecule , absorption spectroscopy , spectroscopy , organic chemistry , physics , demography , quantum mechanics , sociology
A combined spectroscopic and chemical study is performed on thermal and nonthermal SrCl. The Δ v = 0 sequence of the B 2 Σ ← X 2 Σ electronic transition is used for absorption spectroscopy up to high vibrational quantum numbers v with the technique of laser‐induced fluorescence. Effective spectroscopic constants are derived that are valid up to high v . SrCl is investigated both as a product of oven reactions and of the reaction of Sr beam atoms with the chlorinated methane molecules in the observation region (henceforth referred to as the gas‐phase reaction), leading to thermal and nonthermal spectra, respectively. One of the possible oven reactions, the metal‐salt reaction Sr + SrCl 2 → 2SrCl, yields a thermal spectrum with a vibrational temperature equal to the oven temperature. The reaction Sr + CH 2 Cl 2 → SrCl + CH 2 Cl apparently has a small cross section for the gas phase, since only a thermal spectrum is observed. The reaction Sr + CHCl 3 → SrCl + CHCl 2 yields a combined thermal and nonthermal spectrum. The gas‐phase reaction leads to SrCl product molecules with a vibrational population distribution peaked around v = 17. The reaction Sr + CCl 4 → SrCl + CCl 3 has a large cross section for the gas phase with a distribution peaked around v = 27. In this reaction, nearly all available energy is disposed into internal energy of the SrCl product.