Abstract

A new triplet band system of C₃ was discovered near 6500 cm⁻¹ in absorption using distributed feedback diode lasers as radiation sources. The band system was also found in emission from a microwave discharge of CH₄ in He. High-resolution infrared emission spectra of the PtH molecule have also been observed with the Kitt Peak Fourier transform spectrometer. The source was a platinum hollow cathode operating with argon containing a trace of hydrogen. It was possible to assign some weak lines around 8300 cm⁻¹ to (0,0) and (1,1) bands of a 3/2-3/2 transition. The lower 3/2 state was previously known and is about 4000 cm⁻¹ above the X²Δ_5/2 ground state.

© 1990 Optical Society of America