Th e bands of C2D 2 at 1.96 a nd 2.39 mi crons have been m eas ured u nd er hig h resolut ion so that t he moments of inert ia of this m olec ul e could be co mpa red w it h t ha t of C2H 2 and C2HD . From t he meas urem ent of t he rota t ional stru cture t he ground rot at iona l constant, B&, is found to be 0.8471 cm-I The center of t he W I + W3 ba nd is 5097.07 cm-I aDd t he center of W2 + W 3 is 4190.46 em-I. '
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Plyler et al. (1951) studied this question.