Measurement of the rotational alignment in the presence of the second order AC Stark effect

Wetzig, D.; Rudert, Armin D.; Zacharias, H.

doi:10.1007/s100530170021

Cited by 6 publications

(5 citation statements)

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“…The AC-Stark effect in the H 2 Lyman bands was investigated recently by Wetzig et al (32). The intensity of the XUV beam in the present experiment is so low (sub-nJ pulse energies in a diverging beam) that its AC-Stark inducing effects may be neglected, and the UV-ionizing laser in the 1 + 1 two-photon ionization process dominates the AC-Stark shifts.…”

Section: Experiments and Assessment Of Error Budgetmentioning

confidence: 58%

Frequency-mixing scheme for the production of tunable narrowband XUV radiation (91–95 nm): application to precision spectroscopy and predissociation in diatomic molecules

et al. 2004

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(v , 0) Werner bands for v = 0-4, using a narrow-band tunable extreme UV laser source at wavelengths λ = 92-105 nm in conjunction with the technique of 1 + 1 two-photon ionization. The measurements can be divided into three categories for which varying absolute accuracies were obtained. Special focus was on the B, v = 2-5 bands, where an accuracy of 0.004 cm −1 or δν/ν = 4 × 10 −8 is achieved. For transitions to B, v ≤ 13 and C, v ≤ 3 states the accuracy is 0.005 cm −1 or δν/ν = 5 × 10 −8 . Due to a different frequency mixing scheme uncertainties for B, v ≥ 13 and C, v = 4 are at the level of 0.011 cm −1 or δν/ν = 1.1 × 10 −7 . Inspection of combination differences between R(J ) and P(J + 2) lines shows that the accuracies are even better than estimated in the error budget. Based on the measurements of 138 spectral lines and the known combination differences, transition frequencies of 60 P-lines could be calculated as well, so that a data base of 198 accurately calibrated lines results for the Lyman and Werner bands of H 2 .Key words: vacuum UV, molecular spectroscopy, hydrogen, precision metrology. . Un examen des différences des combinaisons entre les raies R(J ) et P(J + 2) montre que les précisions sont meilleures que celles évaluées dans le budget des erreurs. Sur la base de mesures de 138 raies spectrales et de différences de combinaison connues, on a pu aussi calculer les fréquences de transition de 60 raies P et il en résulte qu'une base de données de 198 raies bien calibrées est disponible pour les bandes de Lyman et de Werner du H 2 .

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Section: Experiments and Assessment Of Error Budgetmentioning

confidence: 58%

Frequency-mixing scheme for the production of tunable narrowband XUV radiation (91–95 nm): application to precision spectroscopy and predissociation in diatomic molecules

et al. 2004

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“…In recent years, the field-matter interaction has become an interesting topic of many dynamical calculations [1][2][3][4][5][6][7][8][9][10]. In order to investigate the interaction conveniently, the concept of light-induced potential is introduced and applied to study the photoionization and photodissociation of molecules by many researchers [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Theoretical treatment of intense laser fields influence on the femtosecond time-resolved photoelectron spectrum of RbI molecule

Liu¹,

Meng²

2006

Chemical Physics

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“…[1][2][3][4][5] Consequently, there is great interest in methods that could potentially be used to prepare a large number of isolated H 2 molecules in a single, metastable (v, J, M) quantum state; where v and J are the vibrational and rotational quantum numbers for the gasphase molecule and M is the projection of the angular momentum vector, J, along a chosen symmetry axis of the collision system. [6][7][8][9] Although stimulated Raman adiabatic passage (STIRAP) 10 and Stark chirped two-photon, or Raman adiabatic passage (SCRAP), [11][12][13][14][15][16] might be thought of as appropriate methods for transferring population between rovibrational eigenstates of H 2 , they require a suitably resonant, or near resa) N. Mukherjee 2 , or any other molecule having a wide energy bandgap between the ground and excited electronic levels, STIRAP or SCRAP will require the use of vacuum ultraviolet (VUV) or extreme ultraviolet (XUV) pulses, making it difficult to realize in practice. Moreover, in the presence of an intermediate vibronic resonance, the short wavelength pulses may cause significant ionization or dissociation of the molecule.…”

mentioning

confidence: 99%

Communication: Transfer of more than half the population to a selected rovibrational state of H2 by Stark-induced adiabatic Raman passage

Mukherjee

Dong

Harrison

et al. 2013

The Journal of Chemical Physics

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By using Stark-induced adiabatic Raman passage (SARP) with partially overlapping nanosecond pump (532 nm) and Stokes (683 nm) laser pulses, 73% ± 6% of the initial ground vibrational state population of H2 (v = 0, J = 0) is transferred to the single vibrationally excited eigenstate (v = 1, J = 0). In contrast to other Stark chirped Raman adiabatic passage techniques, SARP transfers population from the initial ground state to a vibrationally excited target state of the ground electronic surface without using an intermediate vibronic resonance within an upper electronic state. Parallel linearly polarized, co-propagating pump and Stokes laser pulses of respective durations 6 ns and 4.5 ns, are combined with a relative delay of ∼4 ns before orthogonally intersecting the molecular beam of H2. The pump and Stokes laser pulses have fluences of ∼10 J/mm2 and ∼1 J/mm2, respectively. The intense pump pulse generates the necessary sweeping of the Raman resonance frequency by ac (second-order) Stark shifting the rovibrational levels. As the frequency of the v = 0 → v = 1 Raman transition is swept through resonance in the presence of the strong pump and the weaker delayed Stokes pulses, the population of (v = 0, J = 0) is coherently transferred via an adiabatic passage to (v = 1, J = 0). A quantitative measure of the population transferred to the target state is obtained from the depletion of the ground-state population using 2 + 1 resonance enhanced multiphoton ionization (REMPI) in a time-of-flight mass spectrometer. The depletion is measured by comparing the REMPI signal of (v = 0, J = 0) at Raman resonance with that obtained when the Stokes pulse is detuned from the Stark-shifted Raman resonance. No depletion is observed with either the pump or the Stokes pulses alone, confirming that the measured depletion is indeed caused by the SARP-induced population transfer from the ground to the target state and not by the loss of molecules from photoionization or photodissociation. The two-photon resonant UV pulse used for REMPI detection is delayed by 20 ns with respect to the pump pulse to avoid the ac Stark shift originating from the pump and Stokes laser pulses. This experiment demonstrates the feasibility of preparing a large ensemble of isolated molecules in a preselected single quantum state without requiring an intermediate vibronic resonance.

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Measurement of the rotational alignment in the presence of the second order AC Stark effect

Cited by 6 publications

References 1 publication

Frequency-mixing scheme for the production of tunable narrowband XUV radiation (91–95 nm): application to precision spectroscopy and predissociation in diatomic molecules

Frequency-mixing scheme for the production of tunable narrowband XUV radiation (91–95 nm): application to precision spectroscopy and predissociation in diatomic molecules

Theoretical treatment of intense laser fields influence on the femtosecond time-resolved photoelectron spectrum of RbI molecule

Communication: Transfer of more than half the population to a selected rovibrational state of H2 by Stark-induced adiabatic Raman passage

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