TheBtilde;thinsp;4sum;minus;undash;Xtilde;thinsp;4sum;minus;gelectronic transition of C+2has been detected in the gas phase by recording its laser excitation spectrum. The rotational structure is resolved and the 0ndash;0, 1ndash;0, and 0ndash;1 bands are discussed. The origin lies at 19thinsp;730.6(2) cmminus;1. The analysis shows that only odd rotational lines are present whereas in the also recorded spectrum of13C+2, a 3:1 intensity alternation is seen, the even lines being the strongest. The assignment follows on the basis of the rotational structure, isotopic effects and comparison with the data obtained recently in a Ne matrix and with theoretically calculated values. The spectroscopic constantsTe,ohgr;e,ohgr;exe,B0,B1are given for theBtilde;4thinsp;sum;minus;uandXtilde;thinsp;4sum;minus;gand C+2.
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