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>Negativehyphen;ion mass spectrometric study of ionhyphen;pair formation in the vacuum ultraviolet. VI. CH3Xrarr;Xminus;+CH+3(X=F, Cl, Br)
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Negativehyphen;ion mass spectrometric study of ionhyphen;pair formation in the vacuum ultraviolet. VI. CH3Xrarr;Xminus;+CH+3(X=F, Cl, Br)
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机译：Negativehyphen;ion mass spectrometric study of ionhyphen;pair formation in the vacuum ultraviolet. VI. CH3Xrarr;Xminus;+CH+3(X=F, Cl, Br)
Ionhyphen;pair formation from photoexcited halomethanes, CH3Xast;rarr;Xminus;+CH+3(X=F, Cl, Br) has been studied by measuring photodissociation efficiency curves of Xminus;using synchrotron radiation in the 9.9ndash;27.5 eV photon energy range. A new spectral feature is observed in each of the curves near the threshold for the removal of anna1electron from CH3X (n=4, 6, and 8, respectively, for CH3F, CH3Cl, and CH3Br ). This feature, composed of two or three peaks in each case, is interpreted as resulting from photoexcitation to the Rydberg states converging to CH3X+(Ctilde;thinsp;2A1), which then predissociate into ion pairs through avoided potential energy surface crossings. The interpretation is based on the results of the innerhyphen;shell electron energy loss study by Brion and cohyphen;workers and the photoabsorption study by Hochmann and cohyphen;workers. Peak features are also observed in the Xminus;efficiency curves near the ionization threshold for CH3X+(Xtilde;thinsp;2E). The origins of these peaks are also discussed.
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