The pure rotational spectrum of the X 2Σ+ state of the gaseous SrF radical has been measured using microwave optical double resonance (MODR) techniques. The analysis fully confirms the recent dye laser excitation spectrum and rotational assignment of the B 2Σ+-X 2Σ+ system. Transitions were measured in both the v″ = 0 and v″ = 1 states to give values of Be″ = 0.250533 cm-1, αe″ = 1.546 × 10-3 cm-1 and γ″ (spin-rotation) = 2.49 × 10-3 cm-1. General qualitative features of MODR in 2Σ+ states are treated and suggested improvements for obtaining experimental hyperfine constants are discussed. The more precise ground state constants are merged with the B-X optical analysis to obtain a more accurate set of constants for both states.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry