Degenerate four-wave-mixing spectroscopy in NaH

Motzkus, Marcus; Pichler, Goran; Dillmann, M.; Kompa, K. L.; Hering, P.

doi:10.1007/bf00325204

Cited by 14 publications

(12 citation statements)

References 14 publications

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“…Further control experiments could entail manipulation of the rovibrational population distribution of the H 2 molecule after the collision, which could be detected by ns CARS [156,159,180], or opening the NaH formation channel. It should be noted that this (reactive) channel has already been observed in the above experiments ("laser snow") [181,182,192,193]. The door to control experiments on the NaH 2 exciplex, as already described theoretically, is very nearly open.…”

Section: Discussionmentioning

confidence: 94%

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Evolutionary algorithms and their application to optimal control studies

et al. 2001

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Section: Discussionmentioning

confidence: 94%

“…With suitably modulated excitation pulses, the reactive channel (NaH 2 ) −→ NaH + H should be accessible. Detection of NaH formation is possible using a narrowband CARS or DFWM setup [192,193].…”

Section: Discussionmentioning

confidence: 99%

Evolutionary algorithms and their application to optimal control studies

et al. 2001

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“…The spectra are obtained by tuning the wavelength of the DFWMlaser in steps of 0.002 nm and recording the signal of the photomultiplier via a boxcar amplifier by a personal computer. For further details see [23] and [17].…”

Section: Methodsmentioning

confidence: 99%

“…Using pulsed dye lasers with narrow bandwidth one obtains, even at high temperatures, narrow linewidths governed by the natural or collision-induced lifetimes of the involved states. It has been shown previously [23] that this technique is also suitable to observe NaH.…”

Section: Introductionmentioning

confidence: 99%

New Dunham coefficients of the A 1 ∑ +-State of NaH and NaD

Lochbrunner

Motzkus

Pichler

et al. 1996

Z Phys D - Atoms, Molecules and Clusters

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We determined new Dunham coefficients of the A >-State of NaH and NaD from degenerate FourWave-Mixing (DFWM) spectra in the near UV and in the blue spectral region. In the case of NaH we combined these data with results of Rafi et al. and Orth et al.. The new set of coefficients describes the vibrational dependence of the rotational constants B and D and of the band origins from v"0 up to 25. The spectral positions of the lines in our DFWM-spectra can be reproduced by this coefficients with an accuracy better than 0.3 cm\ for J-values415 and 2 cm\ for J-values 425. Especially for high J-values this is an improvement up to 30 times in comparison to Dunham coefficients recommended before. A RKR-potential of the A >-state was calculated with the new coefficients. The Dunham coefficients of NaD were obtained by scaling the NaH coefficients with the reduced masses of the molecules. A comparison of our results to molecular constants determined from the measured NaD-spectra shows good agreement.

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“…44,93 In an earlier experiment 39 a ns laser tuned off-resonant at various points in the red wing of Na to excite the complex and a ns probe laser detected the substantially altered vibrational distribution of the product, H 2 (v).…”

Section: Applicationsmentioning

confidence: 99%

Femtosecond Real-Time Probing of Reactions. 19. Nonlinear (DFWM) Techniques for Probing Transition States of Uni- and Bimolecular Reactions

1996

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Degenerate four-wave mixing (DFWM), using ∼60 femtosecond (fs) laser pulses, is introduced to study transition-state dynamics of chemical reactions in the gas phase. The ultrafast techniques are applied to a range of systems, atomic, unimolecular, and bimolecular. It is shown how fs DFWM can be incorporated in different temporal pulse schemes to extract the dynamics. The DFWM beams are configured in a folded boxcar geometry, producing a spatially separated, background-free, femtosecond signal pulse. Aspects of the technique, such as absorption, are investigated. We have taken advantage of the relatively broad spectral width of the fs pulses and extended the techniques to two-color grating experiments in the gas phase. The unimolecular system, NaI, provided a means of testing this new approach. Our experimental observations of the wave packet motion are in excellent agreement with results obtained using laser-induced fluorescence (LIF). A control experiment was also performed on this system, demonstrating the advantages of the nonlinear technique. Bimolecular reactions were initiated for the system Na+H 2 . Atomic sodium was investigated with fs DFWM and the oscillatory wave packet behavior (2 ps period) was observed, corresponding to the fine structure splitting of the 3p level (17.2 cm -1 ). We also explored the application of fs DFWM to the reactive and nonreactive collisions of the Na+H 2 system, which serves as a good model for studying dynamics of nonadiabatic quenching processes and collision complexes.

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Degenerate four-wave-mixing spectroscopy in NaH

Cited by 14 publications

References 14 publications

Evolutionary algorithms and their application to optimal control studies

Evolutionary algorithms and their application to optimal control studies

New Dunham coefficients of the A 1 ∑ +-State of NaH and NaD

Femtosecond Real-Time Probing of Reactions. 19. Nonlinear (DFWM) Techniques for Probing Transition States of Uni- and Bimolecular Reactions

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