One-photon and consecutive two-photon excitation of Ca2 fluorescence in solid krypton at 12 K

Abstract
Laser‐excited emission from the Ca2 van der Waals dimer isolated in solid krypton has been studied. Analysis of the strong red emission at 14 000 cm−1 gives ωe=80 cm−1, ωexe=0.35 cm−1 for the ground state molecule. Observation of unrelaxed emission up to v′=7 and anti‐Stokes emission due to sequential two‐photon excitation are discussed in terms of excited and ground state vibrational relaxation rates. Resonance Raman scattering from Ca2 at Δν=80, 158, and 236 cm−1 was also observed.