The 3300-cm-1 bands of various isotopes of HCN have been measured with a resolution of about 0.01 cm-1 using the Fourier transform spectrometer constructed by J. Brault and co-workers at the National Solar Observatory. The frequencies of 910 HCN lines obtained from absorption spectra of three different isotopic species are reported with an accuracy of approximately 0.0001 cm-1. Six bands of HCN, four bands of H13CN, and two bands of HC15N were analyzed to obtain band origins, rotational constants, and l-doubling constants. The first (1110 ← 0110) and second (1200 ← 0200 and 1220 ← 0220) hot bands of H13CN are measured at high resolution for the first time. The fine structures of the Q branches of (110 ← 010), (1220 ← 0220), and (1330 ← 0330) "hot bands" of HCN have been completely resolved and measured. The accuracies of the calculated band origins are better than 0.0001 cm-1 for most bands, and the upper state rotational constants (B′) have accuracies which range from 1 × 10-7 to 5 × 10-6 cm-1 (0.003 to 0.015 MHz).
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry