Measurements on Higher J Rotational Lines of Vibration Rotation Bands and Study of Resonances in Linear Polyatomic Molecules I ν_2 and 2ν_2^0 Bands of HC^12N†

Abstract

The ν₂ and the 2ν₂⁰ bands of the HC¹²N molecule have been measured with a vacuum grating spectrometer and the molecular constants evaluated. Observations on the ν₂ band have been carried out to J=40 and the data did not reveal any necessity for introducing an H term in the expression for the rotational term value. The anomalous centrifugal distortion constant observed for the 2ν₂⁰ band has been discussed in the light of current theories. The difference bands 3ν₂¹−ν₂^1(c) and 3ν₂¹−ν₂^1(d) have been identified in the region of absorption of the 2ν₂⁰ band.