laboratory for optical physics and engineering june 22, 2015 laser spectroscopy of the...
DESCRIPTION
Laboratory for Optical Physics and Engineering [1] W.E. Baylis, J. Chem. Phys (1969) [2] L. Blank, D. E. Weeks, and G. S. Kedziora, J. Chem. Phys. 136, (2012). Theoretically Predicted Activation Barrier In Alkali- Rare Gas Pairs Has Not Been Observed Until Now LiXe Interaction Potentials [1]Calculated potential curves of Rb-Ne molecule [2]TRANSCRIPT
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Laboratory for Optical Physics and Engineering
June 22, 2015
LASER SPECTROSCOPY
OF THE PHOTOASSOCIATION
OF Rb–Ar AND Rb–Xe THERMAL PAIRS
A.E. MIRONOV, WILLIAM GOLDSHLAG, K.T. RAYMOND and J.G. EDEN
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Laboratory for Optical Physics and Engineering
Summary
• Alkali-rare gas interactions for R > 4Å have been observed by laser excitation spectroscopy combined with free←free photoassociation.
• Theoretically predicted activation barrier in Rb-Xe
and Rb-Ar A21/2 interaction potential has been
detected.
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Laboratory for Optical Physics and Engineering
[1] W.E. Baylis, J. Chem. Phys. 51 2665 (1969)[2] L. Blank, D. E. Weeks, and G. S. Kedziora, J. Chem. Phys. 136, 124315 (2012).
Theoretically Predicted Activation Barrier In Alkali-Rare Gas Pairs Has Not Been Observed Until Now
LiXe Interaction Potentials [1] Calculated potential curves of Rb-Ne molecule [2]
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Laboratory for Optical Physics and Engineering
Our New Technique: Wavelength Sweep Across Rb-Xe Activation Barrier In A Threshold-Biased Rb D2 Laser
A2Π1/2 activation barrier at 5.5Å is intentionally exaggerated
1 kT at 200°C
constant λ (bias)
variable λ
signal
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Laboratory for Optical Physics and Engineering
Experimental Arrangement
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Laboratory for Optical Physics and Engineering
Temporal Evolution of Normalized Pump and ASE Pulse Intensities
Nor
mal
ized
Pul
se a
nd A
SE In
tens
ities
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Laboratory for Optical Physics and Engineering
Rb-Xe Excitation Spectrum
[Rb] = 9.2 ∙1014 cm-3, [Xe] = 1.8 ∙1019 cm-3, λ1 = 759.95 nm, Δτ = 9 ns
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Laboratory for Optical Physics and Engineering
Rb-Ar Excitation Spectrum
[Rb] = 9.2 ∙1014 cm-3, [Rb] = 1.1 ∙1019 cm-3, λ1 = 755 nm, Δτ = 9 ns
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Laboratory for Optical Physics and Engineering
Conclusions
• A new spectroscopic tool has been realized for probing barriers and other weak features in interatomic potentials.
• Barriers in the A2Π1/2 states of Rb-Xe and Rb-Ar have been observed.
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Laboratory for Optical Physics and Engineering
Acknowledgement
The support of this work by the High Energy Laser-Joint Technology Office (HEL-JTO) and the U.S. Air Force Office of Scientific Research (J. Luginsland, J. Marshall) under grants FA9550-13-1-0006 and FA9550-14-1-0002, respectively, is gratefully acknowledged.