Polarized absorption spectrum of ruby between 14,400 and 16,000 cm −1 at 100°K

Abstract

The polarized absorption spectrum of ruby in the region of the 2 E g ← 4 A 2g transition has been studied under moderate resolution at 100°K. The origin of the intensity of this transition is discussed in terms of “borrowing” from the nearby 4 T 2g ← 4 A 2g transition. Calculations of the fluorescent meanlife based on this interpretation are in good agreement with the observed fluorescent lifetime. All the principal bands in this region are capable of a satisfactory interpretation in terms of vibronic coupling between the lattice and the 2 E g ← 4 A 2g transition. No evidence of a 2 T 1g ← 4 A 2g transition around 15,000 cm −1 has been found.