Fourier transform emission spectroscopy of BeF2 at 6.5 μm

Abstract
The high resolution infrared emission spectrum of BeF2 was observed. The fundamental antisymmetric stretching mode ν3 and numerous hot bands involving ν1 and ν2 were found near 1550 cm−1 by Fourier transform spectroscopy. Eight vibration–rotation bands were rotationally analyzed and the spectroscopic constants are reported. The equilibrium beryllium fluorine distance (re) was found to be 1.372 9710(95) Å in BeF2.