“…T h e M n D branch extended from K = l l to K = 26 and the M n H branch from K -4 to K = 12. T h e rotational constants B,", D," and H," were calculated in the manner described by Nevin (1942Nevin ( , 1945 and are given in table 1. A comparison with the results obtained from the (0, 0) and (0, 1) bands indicates that the variation of B,," with v is non-linear.…”