Nitric oxide containing heteroclusters probed by two-photon ionization in a supersonic expansion

Conference · Tue Dec 31 23:00:00 EST 1991

OSTI ID:7276729

Desai, S; Feigerle, C S ^[1]; Miller, J C ^[2]

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1. Tennessee Univ., Knoxville, TN (United States) Oak Ridge National Lab., TN (United States)
2. Oak Ridge National Lab., TN (United States)

Mixed clusters of the form (NO){sub m}Ar{sub n}(m{le}8,n{le}54) are produced in a supersonic expansion, photoionized by nonresonant absorption of 266 nm or 532 photons and detected by time-of-flight mass spectrometry. Anomalously large relative intensities are observed for the cluster ions NO{sup +}Ar{sub n}(n = 12,18,22,54) and (NO){sub 2}{sup +}Ar{sub n}(n =17,21) and are attributed to extra stability of these ions. These magic numbers'' at (m + n) = 13,19,23,55 are compared to those observed in rare gas clusters and other M{sup +}Ar{sub n} heteroclusters and assigned to icosahedral structures. Upon doping the NO/Ar expansion with small amounts of N{sub 2}O, NO{sub 2}, CO{sub 2}, and H{sub 2}O, other mixed clusters an be synthesized. Various cluster ions of the form (NO){sub m}{sup +}(N{sub 2}O){sub n}, (NO){sub m}{sup +}(NO{sub 2}){sub n}{sup +} (H{sub 2}O){sub n}, H{sub 3}O{sup +}(H{sub 2}O){sub n}, (NO){sub m}{sup +}(CO{sub 2}){sub n}, and (NO{sub 2}){sub m}{sup +}Ar{sub n} have been observed. In NO/N{sub 2}O/Ar expansions the cluster ion series (NO){sub 3}{sup +}(N{sub 2}O){sub n} (n = 0-12) is considerably more abundant than clusters of N{sub 2}O about nitric oxide monomers, dimers, or tetramers suggesting an unusually stable structure for the trimer ion cluster.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: DOE; NATO; USDOE, Washington, DC (United States); North Atlantic Treaty Organization, Brussels (Belgium)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7276729
• Report Number(s): CONF-920574-8; ON: DE92016342
• Country of Publication: United States
• Language: English

Related Subjects

664400* -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CHALCOGENIDES
ELEMENTS
FLUID FLOW
FLUIDS
GASES
IONIZATION
LASERS
MULTI-PHOTON PROCESSES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOIONIZATION
RARE GASES
SOLID CLUSTERS
SUPERSONIC FLOW
XENON