Collisional energy transfer in Na(4[ital p]--3[ital d])--He,H[sub 2] collisions

Journal Article · Thu Jan 14 23:00:00 EST 1993 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.464333· OSTI ID:5642870

Kleiber, P D; Wong, T H; Bililign, S ^[1]

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1. Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242 (United States)

We have investigated the direct collisional energy transfer process Na*(4[ital p])+M[r arrow]Na*(3[ital d])+M, where M=He,H[sub 2] under gas cell conditions. We have measured the temporal profiles of the Na(3[ital d]--3[ital p]) sensitized fluorescence as a function of quenching gas pressure and fit the profiles to a two-state rate equation model to obtain the quenching rate coefficients from the Na*(4[ital p]) state. The total energy transfer rate coefficient out of the 4[ital p] state for He is small [(0.5[plus minus]0.2)[times]10[sup [minus]10] cm[sup 3]/s]. The total quenching rate coefficient out of the 4[ital p] state is much larger for H[sub 2][(3.9[plus minus]0.5)[times]10[sup [minus]10] cm[sup 3]/s]. Evidence suggests that the energy transfer rate coefficient for the 4[ital p]--3[ital d] process is [similar to]2.0[times]10[sup [minus]10] cm[sup 3]/s with the remainder of the 4[ital p] quenching being predominantly reactive. We also compare the far-red wing absorption line shapes for the NaHe and NaH[sub 2] systems.

• OSTI ID: 5642870
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 98:2; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
COLLISIONS
D STATES
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
FLUIDS
FLUORESCENCE
GASES
HELIUM
HYDROGEN
LUMINESCENCE
METALS
NONMETALS
P STATES
RARE GASES
RELAXATION
SODIUM