Structure of the Band Spectrum of CuCl Molecule. I. Additional Knowledge in the Coarse Structure

Abstract

A number of new bands in the A, B, C, D, and E systems of CuCl, recorded in the spectrum of the molecule excited in an electrodeless discharge tube by a microwave oscillator, are reported. Because of the employment of high dispersion and the use of a single isotopic species of CuCl (Cu⁶³Cl³⁵), it has been possible to investigate the phenomenon of formation of head of heads in the Δv=−4 sequence of the E system. This phenomenon has also been detected in the Δv=−3 sequence of the A system. The weak F system has been photographed for the first time under suitable dispersion so that a satisfactory vibrational analysis of the same could be made. The R heads of this system of the Cu⁶³Cl³⁵ molecule are represented by the formula $${\nu }_{\text{63,35}}^F{\text{=25287.0+386.8(v}}^{\prime }+\frac{1}{2}{\text{)−1.64(v}}^{\prime }+\frac{1}{2}{)}^2{\text{−417.1(v}}^{\mathrm{\prime \prime }}+\frac{1}{2}{)}^2{\text{+1.50(v}}^{\mathrm{\prime \prime }}+\frac{1}{2}{)}^2.$$ It has been shown that the lower state of the F system is the same as the common lower state of all the other known band systems, which is also the ground state of the molecule. Data on the A and F systems of the Cu⁶⁵Cl³⁵ molecule also are given.