Abstract
Newly calculated radiative transition probabilities for the A 1∑+ → X 1∑+ and C 1∑+ → X 1∑+ emission bands of KH are used to calculate the radiative and nonradiative lifetimes of the various vibrational levels (0 ≤ v ≤ 35) and (0 ≤ v ≤ 55) of A 1∑+ and C 1∑+ states of the diatomic potassium hydride, KH molecule. For higher vibrational levels, an estimate of the bound-to-free emission probability is also needed and included. Accurate positions and radiative and nonradiative lifetimes of states belonging to the adiabatic A and C states of KH molecule are estimated. The results come from a Fermi’s Golden Rule treatment in the coupling calculation. That confirms the accuracy reached in both approaches and also in the treatment of the diabatic-adiabatic transformation. It involves, in particular, an effective phase choice that is needed to properly estimate nonadiabatic couplings.
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Khelifi, N., Oujia, B. & Xavier Gadea, F. Dynamic study: Radiative and nonradiative lifetimes for vibrational levels of the A 1∑+ and C 1∑+ states of the alkali hydride KH. J Russ Laser Res 27, 575–600 (2006). https://doi.org/10.1007/s10946-006-0036-6
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DOI: https://doi.org/10.1007/s10946-006-0036-6
Keywords
- adiabatic representation
- diabatic representation
- Fermi’s Golden Rule
- bound-bound transition
- dynamic coupling
- potential-energy curves
- radiative lifetime
- nonradiative lifetime
- vibrational levels
- electronic spectrum
- hydrogen-isotope effect
- oscillator strengths and Einsteins coefficients
- phases
- adiabatic corrections
- bound-free transition