Accession Number : ADA268372


Title :   Quenching Rate Constants of NF(A1 Delta) by N2F4, NF3, NF(X), SiF4, HNCO and NCO at Room Temperature


Corporate Author : KANSAS STATE UNIV MANHATTAN DEPT OF CHEMISTRY


Personal Author(s) : Du, K ; Setser, D W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a268372.pdf


Report Date : Jan 1993


Pagination or Media Count : 8


Abstract : A flow reactor has been used to measure the room temperature rate constants for quenching of NF(a(sub1) Delta) by molecules containing the NF bond and by SiF4, HNCO, and NCO. The quenching rate constants decrease in the series NF(X), N2F4, NF2, and NF3. The rate constant for NF(X) is (3 + or - 1) x 10(exp -10) cu cm/molecule/s, which is smaller than the bimolecular self-destruction rate constant of NF(a). The quenching rate was so slow for NF3 that only an upper limit to the rate constant, 1.6 x 10(exp -17) cu cm/molecule/s, could be measured. The quenching constant for SiF4 is also small, approximately 1.4 x 10(exp -16) cu cm/molecule/s. The rate constants for HNCO and NCO were measured because these molecules were utilized in the generation of NF(X); estimates for their rate constants are (4.5 + or - 1.0) x 10(exp -13) cu cm/molecule/s. The quenching constants for HNCO and NCO are consistent with those for other carbonyl-containing molecules


Descriptors :   *RATES , *NITROGEN , *ROOM TEMPERATURE , *SILICON , *QUENCHING , *CONSTANTS , *FLUORIDES , REPRINTS , MOLECULES , ESTIMATES , CARBONYL COMPOUNDS , FLOW , DESTRUCTION


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE