The metastable dissociation of CHplus;and CDplus;ions has been investigated. CHplus;(m) from CH4, C2H2, C2H4, CHCl3, CH2Cl2, and CDplus;(m) from CD4, C2D2, C2D4, and CDF3were studied. CHplus;(m) and CDplus;(m) dissociate with an apparent halfhyphen;life of0.4plusmn; 0.2 times; 10minus;6sec and with kinetic energy release in the dissociation of 1.1plusmn;0.3 and 1.4plusmn;0.3 eV, respectively. Using 70 eV electrons, CDplus;(m) and CHplus;(m) are formed with initial kinetic energy, the value being dependent on the compound irradiated. Appearance potential measurements show that when formed from C2H2and C2D2, the CHplus;(m) and CDplus;(m) must dissociate to the lowest dissociation limit of CHplus;, i.e.,Cplus;lpar;2P1sol;20rpar;and H(2S). It is postulated that the metastability arises from a predissociation of theb3Sgr;minus;state with the repulsivec3Sgr;plus;state of CHplus;.
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