ISOTOPE SHIFT OF THE NITROGEN ABSORPTION BANDS IN THE VACUUM ULTRAVIOLET REGION

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Abstract
The vibrational isotope shift of the nitrogen absorption bands has been studied in the 830–1000 Å region. A 3-meter normal-incidence vacuum spectrograph was used with the helium continuum as background.According to our analysis, the vibrational quantum numbers assigned to the lowest observed vibrational levels for the various electronic states of N214 are as follows: , 100 824 cm−1, ν = 0; (b 1Πu), 101 455 cm−1, ν = 1; (l 1Πu), 104 146 cm−1, ν = 5; , 104 366 cm−1, ν = 0; (m 1Πu), 105 350 cm−1, ν = 5 ~ 7; (o 1Πu), 105 703 cm−1, ν = 0; , 106 649 cm−1, ν = 4; (p 1Πu), 108 373 cm−1, ν = 9 ~ 10; , 109 833 cm−1, ν = 11 ~ 12; 110 944 cm−1, ν = 10; (s ?), 116 688 cm−1, ν > 20; and (t ?), 118 486 cm−1, . The observed isotope shift for the bands , 106 381 cm−1; , 108 549 cm−1; (f ?), 110 196 cm−1; 110 664 cm−1; , 112 777 cm−1; (h′ ?), 114 841 cm−1; (h″ ?), 116 820 cm−1; and , 118 778 cm−1 increases in this order and shows that none of these bands corresponds to a (0, 0) band.

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