Sub-Doppler optical-optical double resonance polarization spectroscopy and collisional energy transfer

Kasahara, S.; Ikoma, Heiji; Katô, Hajime

doi:10.1007/bf03156405

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…As was found using the VSDR method [4], the linewidths increase steadily with j , reflecting the increasing angle through which the initial distribution of velocity vectors is scattered. A more striking demonstration of this steady linewidth increase is reported by Kasahara and Katô [20] in their study of NaK-K collisions. Unfortunately, despite the high quality of their spectra, the mass ratio in this collision system mitigates against the extraction of accurate data on the fate of the relative velocity vector.…”

Section: Vslp Resultsmentioning

confidence: 54%

“…These authors pointed out the potential utility of the method for investigating collisional interactions, but it has been little used until very recently. Kasahara and Katô [20] studied velocity changing processes in inelastic K-NaK collisions using LPS lineshapes and found that velocity thermalization takes place long before the polarization signal is lost and that this signal is retained throughout much vibrational and rotational transfer. We have observed that the m quantum number is remarkably stable to elastic and inelastic collisions [21] in diatomic molecules.…”

Section: Principlesmentioning

confidence: 99%

See 1 more Smart Citation

Evidence for hybrid classical - quantal behaviour in state- and angle-resolved atom - diatom scattering

McCaffery¹,

Wilson²

1997

J. Phys. B: At. Mol. Opt. Phys.

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We present measurements of the state-to-state differential scattering cross section (DCS) for X 1 + g Na 2 with Xe using a new sub-Doppler spectroscopic method and compare results with those obtained using molecular beam techniques on the same system; the agreement is good. Criteria for comparison are based on the recent finding (McCaffery A J and Wilson R J 1996 Phys. Rev. Lett. 77 48) that simple quasiclassical vector relations determine the direction of the initial relative velocity vector and the scattering angle. The incident velocity direction is such that the perpendicular component just opens the inelastic channel and the parallel component is scattered. The relationship is Newtonian but is modified by the molecule's characteristic quantum structure. Angular distributions from a range of experiments are found to obey the vector relation, suggesting that atom-molecule collisions are controlled by a quantum-modified Newtonian mechanics, the modification arising as a consequence of the internal energy level structure of the molecule. We introduce the term quantum-constrained kinematics to describe the hybrid mechanics and suggest that this may also influence other collisional events.

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Section: Vslp Resultsmentioning

confidence: 54%

Section: Principlesmentioning

confidence: 99%

Evidence for hybrid classical - quantal behaviour in state- and angle-resolved atom - diatom scattering

McCaffery¹,

Wilson²

1997

J. Phys. B: At. Mol. Opt. Phys.

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Velocity selected laser polarization spectroscopy: a powerful and versatile method of obtaining the state-to-state differential cross section

Wilson

McCaffery

1996

Chemical Physics Letters

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Collisional transfer of population and orientation in NaK

Wolfe

Ashman

Bai

et al. 2011

The Journal of Chemical Physics

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Collisional satellite lines with |ΔJ| ≤ 58 have been identified in recent polarization spectroscopy V-type optical-optical double resonance (OODR) excitation spectra of the Rb(2) molecule [H. Salami et al., Phys. Rev. A 80, 022515 (2009)]. Observation of these satellite lines clearly requires a transfer of population from the rotational level directly excited by the pump laser to a neighboring level in a collision of the molecule with an atomic perturber. However to be observed in polarization spectroscopy, the collision must also partially preserve the angular momentum orientation, which is at least somewhat surprising given the extremely large values of ΔJ that were observed. In the present work, we used the two-step OODR fluorescence and polarization spectroscopy techniques to obtain quantitative information on the transfer of population and orientation in rotationally inelastic collisions of the NaK molecules prepared in the 2(A)(1)Σ(+)(v' = 16, J' = 30) rovibrational level with argon and potassium perturbers. A rate equation model was used to study the intensities of these satellite lines as a function of argon pressure and heat pipe oven temperature, in order to separate the collisional effects of argon and potassium atoms. Using a fit of this rate equation model to the data, we found that collisions of NaK molecules with potassium atoms are more likely to transfer population and destroy orientation than collisions with argon atoms. Collisions with argon atoms show a strong propensity for population transfer with ΔJ = even. Conversely, collisions with potassium atoms do not show this ΔJ = even propensity, but do show a propensity for ΔJ = positive compared to ΔJ = negative, for this particular initial state. The density matrix equations of motion have also been solved numerically in order to test the approximations used in the rate equation model and to calculate fluorescence and polarization spectroscopy line shapes. In addition, we have measured rate coefficients for broadening of NaK 3(1)Π ← 2(A)(1)Σ(+)spectral lines due to collisions with argon and potassium atoms. Additional broadening, due to velocity changes occurring in rotationally inelastic collisions, has also been observed.

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Sub-Doppler optical-optical double resonance polarization spectroscopy and collisional energy transfer

Cited by 4 publications

References 10 publications

Evidence for hybrid classical - quantal behaviour in state- and angle-resolved atom - diatom scattering

Evidence for hybrid classical - quantal behaviour in state- and angle-resolved atom - diatom scattering

Velocity selected laser polarization spectroscopy: a powerful and versatile method of obtaining the state-to-state differential cross section

Collisional transfer of population and orientation in NaK

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