Excitation of H2 at large internuclear separation: outer well states and continuum resonances

T. M. Trivikram, E. J. Salumbides, Ch Jungen, W. Ubachs

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Bound and free quantum resonances of molecular hydrogen exhibiting wave-function density at large internuclear separation, (Formula presented.) 4–5 a.u., are excited via multi-step laser spectroscopy. Highly excited vibrational levels of H (Formula presented.) are prepared via two-photon UV-photolysis of H (Formula presented.) S. Subsequent two-photon Doppler-free precision measurements are performed connecting (Formula presented.) levels with (Formula presented.) outer-well levels. Detection and spectroscopic labelling of the quantum states is assisted by further laser excitation into the auto-ionisation continuum employing a third UV-laser. Level energies of high rotational states ((Formula presented.)) in the outer-well state (Formula presented.) are accurately determined. The three-laser study demonstrates a method for probing resonances in the H (Formula presented.) ionisation continuum with wave-function density at large internuclear separation (Formula presented.) 4–5 a.u., large angular momenta J, and energy range 131,100–133,000 cm −1, a hitherto unexplored territory.

Original languageEnglish
Pages (from-to)2961-2971
Number of pages11
JournalMolecular Physics
Volume117
Issue number21
Early online date29 Mar 2019
DOIs
Publication statusPublished - 2 Nov 2019

Keywords

  • Molecular hydrogen
  • autoionisation
  • complex resonance
  • laser spectroscopy
  • outer-well states

Cite this

@article{ba40aacff4764ed69c17ca91e4a7ad25,
title = "Excitation of H2 at large internuclear separation: outer well states and continuum resonances",
abstract = "Bound and free quantum resonances of molecular hydrogen exhibiting wave-function density at large internuclear separation, (Formula presented.) 4–5 a.u., are excited via multi-step laser spectroscopy. Highly excited vibrational levels of H (Formula presented.) are prepared via two-photon UV-photolysis of H (Formula presented.) S. Subsequent two-photon Doppler-free precision measurements are performed connecting (Formula presented.) levels with (Formula presented.) outer-well levels. Detection and spectroscopic labelling of the quantum states is assisted by further laser excitation into the auto-ionisation continuum employing a third UV-laser. Level energies of high rotational states ((Formula presented.)) in the outer-well state (Formula presented.) are accurately determined. The three-laser study demonstrates a method for probing resonances in the H (Formula presented.) ionisation continuum with wave-function density at large internuclear separation (Formula presented.) 4–5 a.u., large angular momenta J, and energy range 131,100–133,000 cm −1, a hitherto unexplored territory.",
keywords = "Molecular hydrogen, autoionisation, complex resonance, laser spectroscopy, outer-well states",
author = "Trivikram, {T. M.} and Salumbides, {E. J.} and Ch Jungen and W. Ubachs",
year = "2019",
month = "11",
day = "2",
doi = "10.1080/00268976.2019.1599457",
language = "English",
volume = "117",
pages = "2961--2971",
journal = "Molecular Physics",
issn = "0026-8976",
publisher = "Taylor and Francis Ltd.",
number = "21",

}

Excitation of H2 at large internuclear separation : outer well states and continuum resonances. / Trivikram, T. M.; Salumbides, E. J.; Jungen, Ch; Ubachs, W.

In: Molecular Physics, Vol. 117, No. 21, 02.11.2019, p. 2961-2971.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Excitation of H2 at large internuclear separation

T2 - outer well states and continuum resonances

AU - Trivikram, T. M.

AU - Salumbides, E. J.

AU - Jungen, Ch

AU - Ubachs, W.

PY - 2019/11/2

Y1 - 2019/11/2

N2 - Bound and free quantum resonances of molecular hydrogen exhibiting wave-function density at large internuclear separation, (Formula presented.) 4–5 a.u., are excited via multi-step laser spectroscopy. Highly excited vibrational levels of H (Formula presented.) are prepared via two-photon UV-photolysis of H (Formula presented.) S. Subsequent two-photon Doppler-free precision measurements are performed connecting (Formula presented.) levels with (Formula presented.) outer-well levels. Detection and spectroscopic labelling of the quantum states is assisted by further laser excitation into the auto-ionisation continuum employing a third UV-laser. Level energies of high rotational states ((Formula presented.)) in the outer-well state (Formula presented.) are accurately determined. The three-laser study demonstrates a method for probing resonances in the H (Formula presented.) ionisation continuum with wave-function density at large internuclear separation (Formula presented.) 4–5 a.u., large angular momenta J, and energy range 131,100–133,000 cm −1, a hitherto unexplored territory.

AB - Bound and free quantum resonances of molecular hydrogen exhibiting wave-function density at large internuclear separation, (Formula presented.) 4–5 a.u., are excited via multi-step laser spectroscopy. Highly excited vibrational levels of H (Formula presented.) are prepared via two-photon UV-photolysis of H (Formula presented.) S. Subsequent two-photon Doppler-free precision measurements are performed connecting (Formula presented.) levels with (Formula presented.) outer-well levels. Detection and spectroscopic labelling of the quantum states is assisted by further laser excitation into the auto-ionisation continuum employing a third UV-laser. Level energies of high rotational states ((Formula presented.)) in the outer-well state (Formula presented.) are accurately determined. The three-laser study demonstrates a method for probing resonances in the H (Formula presented.) ionisation continuum with wave-function density at large internuclear separation (Formula presented.) 4–5 a.u., large angular momenta J, and energy range 131,100–133,000 cm −1, a hitherto unexplored territory.

KW - Molecular hydrogen

KW - autoionisation

KW - complex resonance

KW - laser spectroscopy

KW - outer-well states

UR - http://www.scopus.com/inward/record.url?scp=85063876107&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063876107&partnerID=8YFLogxK

U2 - 10.1080/00268976.2019.1599457

DO - 10.1080/00268976.2019.1599457

M3 - Article

VL - 117

SP - 2961

EP - 2971

JO - Molecular Physics

JF - Molecular Physics

SN - 0026-8976

IS - 21

ER -