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 04:00:00 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), Journal Name: J. Chem. Phys.; (United States) Vol. 71:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

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