Rotational Analysis of the Emission Spectrum of CuF

Abstract

The emission spectrum of gaseous HF at pressures of about 0.1 mm in a copper hollow cathode has been examined from 7000 to 2000A and an unknown band spectrum of widely spaced lines lying in the region 2450-2600A thought to be the $^{2}\ensuremath{\Sigma}\ensuremath{\rightarrow}^{2}\ensuremath{\Pi}$ transition of H${\mathrm{F}}^{+}$ has been found. From the same source the emission spectrum of CuF has been obtained and was photographed on the 30,000-lines-per-inch Chicago grating spectrograph. The spectrum consists of 3 band systems lying at 5700A, 5060A, and 4920A. A rotational analysis of the spectrum has shown the three systems to have the same lower state, and to be of the type $^{1}\ensuremath{\Pi}\ensuremath{\rightarrow}^{1}\ensuremath{\Sigma}$. $^{1}\ensuremath{\Sigma}\ensuremath{\rightarrow}^{1}\ensuremath{\Sigma}$, and $^{1}\ensuremath{\Pi}\ensuremath{\rightarrow}^{1}\ensuremath{\Sigma}$. The constants of these states are given in the following table: The calculated rotational isotope effect has been found to check very well that measured experimentally.