Formation of negative cluster ions in collision of SF/sub 6/ clusters with krypton rydberg atoms

Journal Article · Thu Apr 10 04:00:00 EST 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100399a019· OSTI ID:5905401

Mitsuke, K; Kondow, T; Kuchitsu, K

Neutral SF/sub 6/ clusters formed in supersonic beam seeded in He were subjected to impact of either high-Rydberg atoms (RAI) or electrons with an average energy of approx. =2.5 eV (EI). Negative ions, (SF/sub 6/)/sub n//sup -/(1 less than or equal to n less than or equal to 11), produced by RAI were observed by mass spectrometry, while SF/sub 5//sup -/ and a trace of (SF/sub 6/)/sub n-1/SF/sub 5//sup -/ (2 less than or equal to n less than or equal to 4) were also observed by EI. The intensities of (SF/sub 6/)/sub n//sup -/ (n greater than or equal to 3) produced by RAI decreased less rapidly with increasing n than those produced by EI. This difference in the size distributions is ascribed to that in the degree of evaporation of SF/sub 6/ molecules from the cluster ions: In RAI the evaporation does not extensively influence the distribution, whereas in EI several molecules are removed from the cluster ion in order to release the excess energy given by the electron trapped in the cluster. The absence of (SF/sub 6/)/sub n-1/SF/sub 5//sup -/ (n greater than or equal to 2) in RAI is probably caused by the smallness of the excess vibrational energy localized in the SF/sub 6//sup -/ component in (SF/sub 6/)/sub n//sup -/. The small cross section for the corresponding dissociative electron attachment in EI suggests that the energy of the attached electron is transmitted more efficiently to the intermolecular vibrations of the cluster ion than to the intramolecular vibrations of the SF/sub 6//sup -/ component in (SF/sub 6/)/sub n//sup -/.

• Research Organization: Univ. of Tokyo, Japan
• OSTI ID: 5905401
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:8; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CHEMICAL PREPARATION
COLLISIONS
DATA
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FERMIONS
FLUID FLOW
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
INFORMATION
ION PAIRS
KRYPTON
LEPTONS
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
RARE GASES
RYDBERG STATES
SULFUR COMPOUNDS
SULFUR FLUORIDES
SUPERSONIC FLOW
SYNTHESIS
VIBRATIONAL STATES