Molecular beam measurements of inelastic cross sections for transitions between defined rotational states (j,m) of CsF in collisions with He, Ne, Ar, Kr, CH/sub 4/, CF/sub 4/, SF/sub 6/, C/sub 2/H/sub 6/, N/sub 2/, CO, CO/sub 2/, N/sub 2/O, CH/sub 3/Cl, CH/sub 3/Br, CF/sub 3/H, and CF/sub 3/Br

Journal Article · Wed Aug 15 00:00:00 EDT 1979 · J. Chem. Phys.; (United States)

OSTI ID:6050437

Borkenhagen, U; Malthan, H; Toennies, J P

Absolute inelastic cross sections for rotational quantum state to state transitions have been measured in small angle grazing collisions of CsF molecules in collisions with He, Ne, Ar, Kr, Xe, CH/sub 4/, CF/sub 4/, SF/sub 6/, C/sub 2/H/sub 6/, N/sub 2/, CO, CO/sub 2/, N/sub 2/O, CH/sub 3/Cl, CH/sub 3/Br, CF/sub 3/H, CH/sub 3/Cl, CF/sub 3/Br. For the rare gas collision partners the following ..delta..j=1, ..delta..m=0 transitions were measured: (j,m) = (1,0) ..-->.. (2,0), (2,0) ..-->.. (1,0), (2,0) ..-->.. (3,0), (3,0) ..-->.. (2,0) as well as the ..delta..j=2, ..delta..m=0 transition (3,0) ..-->.. (1,0). In addition the ..delta..j=1, ..delta..m=1 transitions (1,1) ..-->.. (2,0) and (2,0) ..-->.. (3,1) and the pure ..delta..m=1 transitions (1,1) ..-->.. (1,0) and (3,0) ..-->.. (3,1) were measured. In each case the signs of m and ..delta..m are undetermined. For the other scattering partners only the ..delta..j=1, ..delta..m=0 and ..delta..j=2, ..delta..m=0 transitions were measured. In the collision region the quantization axis of the CsF molecules is defined by a weak electric field (300 V/cm) directed perpendicular to the direction of the velocity selected CsF and the target nozzle beam and thus perpendicular to the relative velocity vector. The apparatus and the techniques used to determine the absolute cross sections are given and the formulas used to derive the various types of cross sections from the pressure dependences are derived. Because of the favorable geometry and nearly monoenergetic conditions it was possible to calculate by a Monte Carlo method a transmission function for each rare gas and transition studied. The tabulated transmission functions make it possible to compare theoretical predicted differential cross sections directly with the reported values. An approximate analytic expression is also given for the (2,0) ..-->.. (3,0) transition which can be used for all scattering targets. Absolute cross sections in the cms for all systems are obtained.

• Research Organization: Max-Planck-Institut fuer Stroemungsforschung, 3400 Goettingen, Federal Republic of Germany
• OSTI ID: 6050437
• Journal Information: J. Chem. Phys.; (United States), Vol. 71:4
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM-MOLECULE COLLISIONS
CARBON DIOXIDE
MOLECULE-MOLECULE COLLISIONS
CARBON MONOXIDE
CARBON TETRAFLUORIDE
CESIUM FLUORIDES
ETHANE
HALOGENATED ALIPHATIC HYDROCARBONS
HELIUM
KRYPTON
METHANE
NEON
NITROGEN
NITROUS OXIDE
SULFUR FLUORIDES
XENON
CROSS SECTIONS
DATA
ENERGY-LEVEL TRANSITIONS
INELASTIC SCATTERING
MOLECULAR BEAMS
ROTATIONAL STATES
ALKALI METAL COMPOUNDS
ALKANES
ATOM COLLISIONS
BEAMS
CARBON COMPOUNDS
CARBON OXIDES
CESIUM COMPOUNDS
CHALCOGENIDES
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
INFORMATION
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SCATTERING
SULFUR COMPOUNDS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena