Abstract

A strong infrared emission band spectrum of Si₂ was observed in the region between 4500 and 6500 cm⁻¹. It consists of 21 red-degraded bands, which are transitions between two newly observed low-lying singlet states d¹Σ_g⁺–b¹Π_μ. The bands arise from transitions between vibrational levels from 0 to 6 in both electronic states. Rotational lines up to J = 162 were observed. A global fit was made to 2000 spectral lines, and fits were made to individual branches of each band. The source was a King-type furnace charged with SiC, filled with helium at a pressure of 100 Torr, and maintained at a temperature of 2700 K. The spectrometer was the Fourier-transform instrument at the National Solar Observatory (Kitt Peak).

© 1987 Optical Society of America

CN vibration–rotation spectrum

Sumner P. Davis, Mark C. Abrams, M. L. P. Rao, and James W. Brault
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Infrared bands of the C₂ Phillips system

Sumner P. Davis, Mark C. Abrams, John G. Phillips, and M. L. P. Rao
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N₂O vibration–rotation parameters derived from measurements in the 900–1090-and 1580–2380-cm⁻¹ regions

Robert A. Toth
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Infrared–infrared double-resonance spectra of the ν₅ and ν₆ bands of CHD₂F

G. Duxbury and J. McCombie
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Constants of the 5s ¹Σg+ state of Na₂ from two-photon spectroscopy

G.-Y. Yan, T. P. Duffey, W.-M. Du, and A. L. Schawlow
J. Opt. Soc. Am. B 4(11) 1829-1834 (1987)