Measurement of pressure-broadening parameters for the CO-He system at 4 K

Journal Article · Sun Dec 30 23:00:00 EST 1984 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.53.2555· OSTI ID:6206253

Messer, J K; De Lucia, F C

A technique has been developed to observe collisions in a regime where the rotational energy-level separation is greater than the thermal energy. Pressure-broadening parameters of trace quantities of CO, thermalized by collisions with helium at 4 K, were measured and found to be 10.1 and 11.2 MHz/Torr half width at half maximum for the J = 0-1 and J = 1-2 transitions, respectively. At 4 K only a small number of collision channels are energetically available and comparisons between experiment and theory are facilitated.

• Research Organization: Department of Physics, Duke University, Durham, North Carolina 27706
• OSTI ID: 6206253
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 53:27; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
DATA
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
INFORMATION
LINE BROADENING
LINE WIDTHS
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PRESSURE EFFECTS
RARE GASES
ROTATIONAL STATES
ULTRALOW TEMPERATURE