Quenching of internal rotations versus collisional cooling at ultralow energies for weakly interacting partners: Cs{sub 2}({sup 3{Sigma}}{sub u}{sup +}) with {sup 3,4}He

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.042710· OSTI ID:21408626

Caruso, D; Tacconi, M; Gianturco, F A ^[1]; Yurtsever, E ^[2]

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1. Department of Chemistry and CNISM, University of Rome La Sapienza, Piazzale A. Moro 5, I-00185 Rome (Italy)
2. Department of Chemistry, Koc University, Rumelifeneriyolu, TR-34450 Sariyer, Istanbul (Turkey)

Quantum-scattering calculations at ultralow (close to 10{sup -6} cm{sup -1}) collision energies are carried out for the Cs dimer in its spin-stretched triplet state, interacting with helium. An ab initio potential energy surface is computed and employed, while the target molecule is kept in its ground vibrational state and several excitated initial rotational states are considered in the quantum dynamics. The highly anisotropic interaction is seen to cause, in spite of its weakness, internal energy quenching rates comparable with the efficiency of the collisional cooling of relative kinetic energies. The rates of spin-flip processes are also analyzed and compared with pure rotational quenching events.

• OSTI ID: 21408626
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
ANISOTROPY
ENERGY
ENERGY LEVELS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITED STATES
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
KINETIC ENERGY
LIGHT NUCLEI
MOLECULES
MULTIPLETS
NUCLEI
PARTICLE PROPERTIES
POTENTIAL ENERGY
QUENCHING
ROTATIONAL STATES
SCATTERING
SPIN
SPIN FLIP
STABLE ISOTOPES
TRIPLETS
VIBRATIONAL STATES