Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Thermochemistry of HNC, HNC+, and CF3+ (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1748-1750 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the course of mechanistic studies on HCN+ isomerization in reaction with CO and CO2, we have fortuitously determined the heats of formation of HNC and HNC+ with good precision. The uncertainty is the uncertainty in the heat of formation of HCN, ±1 kcal mol−1. This appears to be the first precise experimental determination of these energies. Several prior theoretical calculations have produced reasonable energy values. We also observed the reaction of HCN+ with CF4 to be slightly endothermic, which allows the determination of an upper limit on the threshold energy for CF4→CF3++F of 14.28 eV, in excellent agreement with several prior determinations but in sharp disagreement with the most recent determination. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476749
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Relaxation of vibrationally excited HCN+ and DCN+ ions in collisions with He (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 731-735 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A selected ion flow drift tube (SIFDT) has been used to measure vibrational quenching rate constants of HCN+ and DCN+ in collisions with He from 0.05 to 0.35 eV mean relative kinetic energy. The measured quenching rate constants fit linear Landau–Teller (L-T) plots in the 0.20 to 0.35 eV energy range, equivalent to 1540 to 2700 K effective temperature range. These are the first L-T plots for polyatomic ion vibrational quenching. The L-T plots imply large vibrational excitation in the CH (CD) fundamental stretching mode by electron impact ionization of HCN in the threshold to ∼40 eV energy range. The L-T plots also imply that vibrational quenching of the CH (CD) fundamental stretching mode by He is either directly to the ground vibrational state, or possibly to the low-frequency bending mode, but not via the CN stretching mode. There is a large HNC+ ion (45%±5%) production by electron impact ionization of HCN. This is in contrast with HCN photoionization, which yields only HCN+. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480644
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Energy dependence of the isomerization of HCN+ to HNC+ via ion molecule reactions (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1743-1747 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The mechanism for isomerization of HCN+ ions to the more stable HNC+ in collision with CO2 at thermal energy has been confirmed to be a double proton transfer in the collision complex. First a proton is transferred from C in HCN+, then, following CN rotation in the complex, the proton is transferred to the N atom, both proton transfers being exothermic. The mechanism has been established by measuring the reaction of HCN+ with CO2 as a function of energy from thermal up to 0.7 eV relative kinetic energy in a selected ion flow drift tube. The isomers are distinguished by the use of monitors that react differently with the two isomers. A similar HCN+ to HNC+ isomerization occurs in thermal collisions with CO. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476748
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...