Reactions of Ar+ with halocarbons and of I+ with CF3I

Morris, Robert A.; Van Doren, Jane M.; Viggiano, A. A.; Paulson, John F.
July 1992
Journal of Chemical Physics;7/1/1992, Vol. 97 Issue 1, p173
Academic Journal
The gas phase reactions of Ar+ with the halocarbons CF3Cl, CF3Br, CF3I, CF4, C2F6, and C2F4 have been studied using a variable temperature-selected ion flow tube (VT-SIFT) instrument operated at 298 and 500 K. Rate constants and product branching percentages were measured at both temperatures. Ar+ reacts at the collisional rate with all of the above neutrals at both 298 and 500 K. The reactions with CF3X yield CF+3 and CF2X+ for all X (the reaction with CF4 produces only CF+3 ). For X=I, there is an additional channel leading to the ionic product I+. The reaction of Ar+ with C2F6 produces both CF+3 and C2F+5. The reaction of Ar+ with C2F4 forms a rich product spectrum consisting of the ions CF+, CF+2, CF+3, C2F+3, and C2F+4. The reaction product distributions are compared with results from ionization experiments such as photoion–photoelectron coincidence (PIPECO) and electron impact mass spectrometry, and in some cases excellent agreement is found. The reaction of I+ with CF3I, which is a secondary reaction in the Ar+/CF3I system, was investigated at 298 K in separate experiments. This reaction is rapid and forms four product ions: CF+3, CF2I+, CF3I+, and I+2. The results are compared with previously published information.


Related Articles

  • High resolution study of anion formation in low-energy electron attachment to SF6 molecules in a seeded supersonic beam. Braun, M.; Barsotti, S.; Marienfeld, S.; Leber, E.; Weber, J. M.; Ruf, M.-W.; Hotop, H. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Sep2005, Vol. 35 Issue 2, p177 

    Using two variants of the Laser Photoelectron Attachment (LPA) method involving a differentially-pumped, seeded supersonic beam (0.05% and 12.5% of SF6 molecules in helium carrier gas, nozzle temperatures T0= 300–600 K, stagnation pressures p0= 1–5 bar) and mass spectrometric ion...

  • Cobalt–benzene cluster anions: Mass spectrometry and negative ion photoelectron spectroscopy. Gerhards, M.; Thomas, O. C.; Nilles, J. M.; Zheng, W.-J.; Bowen, K. H. // Journal of Chemical Physics;6/15/2002, Vol. 116 Issue 23, p10247 

    (Cobalt)[sub n](benzene)[sup -, sub m] cluster anions, (n,m) were generated by laser vaporization and studied by both mass spectrometry and anion photoelectron spectroscopy. Our assignment of the photoelectron spectrum of the (1,2) cluster anion suggests that it possesses a sandwich structure...

  • Development of a low-temperature photoelectron spectroscopy instrument using an electrospray ion source and a cryogenically controlled ion trap. Wang, Xue-Bin; Wang, Lai-Sheng // Review of Scientific Instruments;Jul2008, Vol. 79 Issue 7, p073108 

    The ability to control ion temperatures is critical for gas phase spectroscopy and has been a challenge in chemical physics. A low-temperature photoelectron spectroscopy instrument has been developed for the investigation of complex anions in the gas phase, including multiply charged anions,...

  • Evidence of the formation and conversion of unstable thionyl isocyanate: Gas-phase spectroscopic studies. Wang, Weigang; Yao, Li; Zeng, Xiaoqing; Ge, Maofa; Sun, Zheng; Wang, Dianxun; Ding, Yihong // Journal of Chemical Physics;12/21/2006, Vol. 125 Issue 23, p234303 

    Thionyl diisocyanate which is unstable at ambient temperature is generated from a heterogeneous reaction of gaseous thionyl dichloride with silver cyanate and studied for the first time in the gas phase at 298 K. N-isocyanatoformyl sulfinylimide is also observed with photoelectron spectroscopy...

  • Mass spectrometric study of the thermochemistry of gaseous EuTiO3 and TiO2. Balducci, G.; Gigli, G.; Guido, M. // Journal of Chemical Physics;8/15/1985, Vol. 83 Issue 4, p1909 

    The gaseous molecule EuTiO3 has been investigated in a high temperature mass spectrometric study of vapors over the europium–titanium–oxygen system. From the enthalpy of reaction: EuTiO3(g)=EuO(g)+TiO2(g) and proper ancillary data, the atomization energy of this molecule has been...

  • An automated gas chromatography time-of-flight mass spectrometry instrument for the quantitative analysis of halocarbons in air. Obersteiner, F.; Bönisch, H.; Engel, A. // Atmospheric Measurement Techniques Discussions;2015, Vol. 8 Issue 9, p9455 

    We present the characterization and application of a new gas chromatography-time-of-flight mass spectrometry instrument (GC-TOFMS) for the quantitative analysis of halocarbons in air samples. The setup comprises three fundamental enhancements compared to our earlier work (Hoker et al., 2015):...

  • High-resolution time-of-flight methods for studies on ionic fragmentation of molecules. Ueda, K.; Shigemasa, E.; Sato, Y.; Yagashita, A.; Sasaki, T.; Hayaishi, T. // Review of Scientific Instruments;Jul1989, Vol. 60 Issue 7, p2193 

    The design and operation of the time-of-flight (TOF) mass spectrometer developed for ionic photofragmentation studies of molecules is described. Characteristics are summarized for three different operation modes of the TOF spectrometer; a pulse mode, a photoelectron-photoion coincidence mode,...

  • Negative ion photoelectron spectroscopy of the negative cluster ion H-(NH3)1. Coe, J. V.; Snodgrass, J. T.; Freidhoff, C. B.; McHugh, K. M.; Bowen, K. H. // Journal of Chemical Physics;9/15/1985, Vol. 83 Issue 6, p3169 

    The negative ion photoelectron spectrum of the negative cluster ion H- (NH3)1 has been recorded with 2.540 eV photons. This negative cluster ion was prepared in a supersonic nozzle-ion source involving the injection of electrons into an expanding jet. While the spectrum is dominated by a...

  • The growth modes of vapor-deposited bismuth on a Cu(110) surface. Clendening, W. D.; Campbell, Charles T. // Journal of Chemical Physics;6/1/1989, Vol. 90 Issue 11, p6656 

    The interactions of vapor-deposited Bi with Cu(110) have been studied with x-ray photoelectron spectroscopy (XPS), thermal desorption mass spectroscopy (TDS), and low-energy electron diffraction (LEED). There is a net repulsive Bi–Bi interaction in the adlayer such that the heat of...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics