Sub-Doppler rovibrational spectroscopy of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> fundamental band of D2H+

Markus, Charles R.; Kocheril, Philip A.; McCall, Benjamin J.

doi:10.1016/j.jms.2018.11.005

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…9,12 When NICE-OHVMS was used to investigate the ν 1 ← 0 fundamental band of D 2 H + , problems with the line center determination were discovered. 20 Disagreements with the values reported by Jusko et al 7 were as large as 4 MHz, well outside of our measured uncertainty. Remeasuring transitions on multiple days revealed dayto-day changes of up to 6 MHz, although the disagreement with the previous values never exceeded 4 MHz.…”

Section: Resultssupporting

confidence: 81%

“…Euler-type Hamiltonians have been successfully used to fit the isotopologues D 2 H + and H 2 D + , and other molecules which suffer from poorly converging Watson-type Hamiltonians. 20,[37][38][39] The Euler functions are built into SPFIT, and the initial guesses for a and b were calculated using the Watson-type parameters as derived by Pickett. 36 The fit was approached in the same manner as the Watson-type fit by incrementally adding states and parameters, and limiting coefficients to the sextic order or lower.…”

Section: B Absolute Energy Levelsmentioning

confidence: 99%

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Highly-Accurate Experimentally Determined Energy Levels of H3+

Markus¹,

McCall²

2019

Proceedings of the 74th International Symposium on Molecular Spectroscopy

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A sub-Doppler rovibrational spectroscopic survey of H 3 + has been conducted which included 36 transitions in the ν 2 ← 0 fundamental band, 15 transitions in the 2ν 2 2 ← ν 2 hot band, and 7 transitions in the 2ν 2 2 ← 0 overtone band, improving the uncertainties of most transitions by more than an order of magnitude to ∼4 MHz. Combination differences were used to determine relative energy levels and forbidden rotational transitions up to J = 6. A fit of the ground state to an effective Hamiltonian was used to connect ortho and para states, and to determine the absolute energy levels relative to the forbidden (0, 0) state. Ultimately, 62 rovibrational energy levels in the ground, ν 2 , and 2ν 2 2 states were determined with ∼10 MHz uncertainty. Comparing the experimentally determined energy levels with ab initio calculations revealed an unexpected dependence of the residuals on the quantum number G.

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Section: Resultssupporting

confidence: 81%

Section: B Absolute Energy Levelsmentioning

confidence: 99%

Highly-Accurate Experimentally Determined Energy Levels of H3+

Markus¹,

McCall²

2019

Proceedings of the 74th International Symposium on Molecular Spectroscopy

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“…In contrast, for atomic and molecular ions under gaseous conditions the best resolutions have been significantly lower. For example, saturation spectroscopy of gas-phase molecular ions has led to 2×10 6 resolution (absolute full linewidths at the 50 MHz level) [54]. Using the ion beam technique, electronic and vibrational transitions have been observed with resolutions up to 2.5 × 10 6 [55] and 4 × 10 6 [56, 57], respectively.…”

Section: G Previous Results On High-resolution Spectroscopymentioning

confidence: 99%

Proton–electron mass ratio by high-resolution optical spectroscopy of ion ensembles in the resolved-carrier regime

et al. 2021

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Optical spectroscopy in the gas phase is one of the key tools for the elucidation of the structure of atoms and molecules and their interaction with external fields. The line resolution is usually limited by a combination of first-order Doppler broadening due to particle thermal motion and of a short transit time through the excitation beam. For trapped particles, suitable laser cooling techniques can lead to strong

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“…Thus, such works can provide better foundation for spectral references and databases of molecules. In another work by Markus et al, several transition lines of the D 2 H + ion were reported in the mid-IR region (∼3.4–3.8 μm) which have astrochemical significance. Here, in conjunction with NICE-OHMS, velocity modulation of the D 2 H + ions (using driving frequency of electrodes for plasma generation) was performed to distinguish the ions from neutral molecules.…”

Section: Optical Cavity-based Advanced Techniquesmentioning

confidence: 87%