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Quantum State-Resolved Collision Dynamics of Nitric Oxide at Ionic Liquid and Molten Metal Surfaces

Event Details

Event Dates: 

Tuesday, April 11, 2017 - 2:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Ameila Zutz

Speaker Affiliation(s): 

JILA, Nesbitt group
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Thesis Defense

Event Details & Abstract: 

Detailed molecular scale interactions at the gas–liquid interface are explored with quantum state-to-state resolved molecular scattering of a jet-cooled beam of NO(2Π1/2; N = 0) from ionic liquid and molten metal surfaces. The scattered rovibronic state distributions are probed via laser-induced fluorescence, which provide insight into energy transfer and scattering pathways at the surface. These collision dynamics are explored as a function of incident collision energy, surface temperature (Ts), scattering angle, and liquid identity, all of which are found to substantially affect the degree of rotational and electronic excitation of NO at the gas-liquid interface. Rotational distributions observed are representative of two distinct scattering pathways, (i) molecules that thermalize and then desorb from the surface, and (ii) those that impulsively scatter. Thermally desorbing molecules are found to have rotational temperatures close to, but slightly cooler than the surface temperature, indicative of rotational dependent sticking probabilities. NO, a radical with multiple low-lying electronic states, also serves as an ideal candidate for exploring collision dynamics at these conductive liquid surfaces, where significant excitation is observed from ground (2Π1/2) to excited (2Π3/2) spin–orbit states. Electron-hole pair mediated vibrational excitation of NO at Ts >1000 K molten metals surfaces (Ga and Au) is also observed. These results highlight the presence of electronically nonadiabatic effects at gas–liquid interfaces and build toward a more complete characterization of energy transfer and dynamics at liquid surfaces.