Photolysis production and spectroscopic investigation of the highest vibrational states in H2 (x1σg+ v = 13, 14)

W. Ubachs*, K. F. Lai, M. Beyer, E. J. Salumbides

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Rovibrational quantum states in the X1Σg+ electronic ground state of H2 are prepared in the v = 13 vibrational level up to its highest bound rotational level J = 7, and in the highest bound vibrational level v = 14 (for J = 1) by two-photon photolysis of H2S. These states are laser-excited in a subsequent two-photon scheme into F1Σg+ outer well states, where the assignment of the highest (v,J) states is derived from a comparison of experimentally known levels in F1Σg+, combined with ab initio calculations of X1Σg+ levels. The assignments are further verified by excitation of F1Σg+ population into autoionizing continuum resonances, which are compared with multichannel quantum defect calculations. Precision spectroscopic measurements of the F-X intervals form a test for the ab initio calculations of ground state levels at high vibrational quantum numbers and large internuclear separations, for which agreement is found.

Original languageEnglish
Pages (from-to)1221-1228
Number of pages8
JournalJournal of Physical Chemistry A
Volume125
Issue number5
Early online date27 Jan 2021
DOIs
Publication statusPublished - 11 Feb 2021

Bibliographical note

Funding Information:
The authors thank Dr. Christian Jungen for fruitful discussions and for making available his MQDT-codes for calculating and assigning the autoionization resonances. W.U. acknowledges the European Research Council for an ERC Advanced Grant (No. 670168).

Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Funding

The authors thank Dr. Christian Jungen for fruitful discussions and for making available his MQDT-codes for calculating and assigning the autoionization resonances. W.U. acknowledges the European Research Council for an ERC Advanced Grant (No. 670168).

FundersFunder number
Horizon 2020 Framework Programme670168

    Fingerprint

    Dive into the research topics of 'Photolysis production and spectroscopic investigation of the highest vibrational states in H2 (x1σg+ v = 13, 14)'. Together they form a unique fingerprint.

    Cite this