Title

Rotationally inelastic collisions of He and Ar with NaK: Theory and Experiment

Presenter Information

Josey Stevens

Department

Physics

Major

Physics

Research Advisor

Hickman, Peet

Advisor's Department

Physics

Funding Source

National Science Foundation (NSF)

Abstract

Rotationally inelastic collisions of NaK (A 1Σ+) molecules with He and Ar have been studied. In the experiments at Lehigh, we use a pump-probe scheme (the probe is scanned over transitions to the 3 1Π state) with either polarization labeling (PL) or laser-induced fluorescence (LIF) spectroscopy. The pump laser excites a particular ro-vibrational level A 1Σ+ (v, J). We observe strong direct lines corresponding to transitions from the (v, J) level pumped, and weak satellite lines corresponding to transitions from collisionally-populated levels (v, J'=J + ΔJ). The ratios of satellite to direct line intensities in LIF and PL yield information about population and orientation transfer. A strong propensity for ΔJ= even transitions is observed for both He and Ar perturbs. Theoretical calculations are also underway for collisions in both the A 1Σ+ and X 1Σ+ states. For He-NaK we have calculated potential surfaces using GAMESS and carried out coupled channel scattering calculations of transfer of population, orientation, and alignment.

Biography

Josey Stevens is a junior in Physics at the Missouri University of Science and Technology. He has done research on Quantum Phase Transitions of Highly Disordered Solid State Systems and Atom Molecule Collision Theory. He is the president of the local Society of Physics Student and will be working at Los Alamos National Labs in the Summer of 2015.

Research Category

Sciences

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hall

Presentation Date

15 Apr 2015, 9:00 am - 11:45 am

Comments

Advisor: Physics-Lehigh University

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Apr 15th, 9:00 AM Apr 15th, 11:45 AM

Rotationally inelastic collisions of He and Ar with NaK: Theory and Experiment

Upper Atrium/Hall

Rotationally inelastic collisions of NaK (A 1Σ+) molecules with He and Ar have been studied. In the experiments at Lehigh, we use a pump-probe scheme (the probe is scanned over transitions to the 3 1Π state) with either polarization labeling (PL) or laser-induced fluorescence (LIF) spectroscopy. The pump laser excites a particular ro-vibrational level A 1Σ+ (v, J). We observe strong direct lines corresponding to transitions from the (v, J) level pumped, and weak satellite lines corresponding to transitions from collisionally-populated levels (v, J'=J + ΔJ). The ratios of satellite to direct line intensities in LIF and PL yield information about population and orientation transfer. A strong propensity for ΔJ= even transitions is observed for both He and Ar perturbs. Theoretical calculations are also underway for collisions in both the A 1Σ+ and X 1Σ+ states. For He-NaK we have calculated potential surfaces using GAMESS and carried out coupled channel scattering calculations of transfer of population, orientation, and alignment.