Precision measurements and test of molecular theory in highly excited vibrational states of H2 (Ν = 11)

T. Madhu Trivikram, M. L. Niu, P. Wcisło, W. Ubachs, E. J. Salumbides*

*Corresponding author for this work

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Accurate EF1Σ+ g - X1Σ+ g transition energies in molecular hydrogen were determined for transitions originating from levels with highly excited vibrational quantum number, Ν = 11, in the ground electronic state. Doppler-free two-photon spectroscopy was applied on vibrationally excited H* 2 , produced via the photodissociation of H2S, yielding transition frequencies with accuracies of 45 MHz or 0.0015 cm-1. An important improvement is the enhanced detection efficiency by resonant excitation to autoionizing 7π electronic Rydberg states, resulting in narrow transitions due to reduced ac-Stark effects. Using known EF level energies, the level energies of X(Ν = 11, J = 1, 3-5) states are derived with accuracies of typically 0.002 cm-1. These experimental values are in excellent agreement with and are more accurate than the results obtained from the most advanced ab initio molecular theory calculations including relativistic and QED contributions.

Original languageEnglish
Title of host publicationExploring the World with the Laser
Subtitle of host publicationDedicated to Theodor Hänsch on his 75th Birthday
EditorsDieter Meschede, Thomas Udem, Tilman Esslinger
Place of PublicationCham
PublisherSpringer International Publishing Switzerland
Number of pages22
ISBN (Electronic)9783319643465
ISBN (Print)9783319643458, 9783319877747
Publication statusPublished - 2018


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