Determinations of EF {sup 1}{sigma}{sub g}{sup +}(leftarrow)X{sup 1}{sigma}{sub g}{sup +} transition frequencies in H{sub 2}, D{sub 2}, and HD

We have measured the energies of several rotational branches of the (0,0) band of the EF {sup 1}{sigma}{sub g}{sup +}(leftarrow)X{sup 1}{sigma}{sub g}{sup +} transition in molecular hydrogen by use of Doppler-free two-photon laser excitation at 202 nm. The accuracy for all three stable isotopic vari...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2006-02, Vol.73 (2)
Main Authors: Yiannopoulou, A., Melikechi, N., Gangopadhyay, S., Meiners, J. C., Cheng, C. H., Eyler, E. E.
Format: Article
Language:English
Subjects:
ACCURACY
ATOMIC AND MOLECULAR PHYSICS
DEUTERIUM
DISSOCIATION ENERGY
EVOLUTION
EXCITATION
HYDROGEN
IONIZATION POTENTIAL
MOLECULES
MULTI-PHOTON PROCESSES
PHOTON-MOLECULE COLLISIONS
PHOTONS
PULSES
ROTATIONAL STATES
ULTRAVIOLET SPECTRA
VARIATIONS
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Summary:We have measured the energies of several rotational branches of the (0,0) band of the EF {sup 1}{sigma}{sub g}{sup +}(leftarrow)X{sup 1}{sigma}{sub g}{sup +} transition in molecular hydrogen by use of Doppler-free two-photon laser excitation at 202 nm. The accuracy for all three stable isotopic variations is 8 parts in 10{sup 9}, nominally a fourfold improvement over previously available results, but some of the transition energies differ from previous work by as much as three standard deviations. The improved accuracy derives principally from our ability to measure the optical phase evolution of nanosecond laser pulses, then to predict quantitatively the line shapes of multiphoton transitions excited by them. The results allow comparably accurate determinations of the EF state term energies, which in turn help to calibrate the entire excited-state spectrum of this fundamental molecular system. These improved calibrations are particularly useful to recent and ongoing efforts to determine the dissociation energy and ionization potential with improved accuracy.
ISSN:1050-2947
1094-1622
DOI:10.1103/PHYSREVA.73.022506