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 language | English |
|---|---|
| Pages (from-to) | 2961-2971 |
| Number of pages | 11 |
| Journal | Molecular Physics |
| Volume | 117 |
| Issue number | 21 |
| Early online date | 29 Mar 2019 |
| DOIs | |
| Publication status | Published - 2 Nov 2019 |
Keywords
- Molecular hydrogen
- autoionisation
- complex resonance
- laser spectroscopy
- outer-well states
Cite this
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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 Journal › Article › Academic › peer-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
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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 -