Infrared diode-laser spectroscopy of the electronic ground state of GeD (X²Π_1/2)

Abstract

The fundamental and the first hot bands of the GeD radical in the X²Π_1/2 state have been detected by tunable diode laser spectroscopy. Transitions from the five naturally occurring isotopes of germanium have been observed. Using an effective Hamiltonian, a set of molecular parameters for the X²Π state was determined using our data combined with those of Zimmermann et al. (1990, Molecular Physics, 70, 167). Values for the vibrational correction to the fine structure constant α_A, the vibrational correction to the Λ-type doubling constant α_A, the vibrational correction to the Λ-type doubling constant α_p+2q, and the spin-rotation constant γ were determined.