Energy transfer and electronic quenching of the low-lying Rydberg states of nitric oxide in nitric oxide/nitrogen mixtures

Abstract

The pyrolysis of 2,5-dihydrofuran was studied behind reflected shocks in a single-pulse shock tube over the temperature range 880-1080 K. The main channel of the pyrolysis is the dehydrogenation reaction to form hydrogen and furan. The rate constants for this reaction obtained at high temperatures scatter along the Arrhenius line extrapolated from the low temperatures. Over the temperature range 615-1030 K (low-and high-temperature data), the rate constant kuni = 5.3 X 1012 exp(-48.5 X 103/7?7') s-1 is valid over more than 6 orders of magnitude in its value. Several reaction products accompany the dehydrogenation although at a much lower rate. The product distribution shows that propylene is the main pyrolitic product, followed by acetylene and methane.

Extension of the molecular quantum defect orbital methodology to the calculation of intensities and lifetimes for vibronic transitions within electronic Rydberg series of NO

“…There are a number of theoretical values, such as the one based upon a single‐reference MCPF procedure with averaged SCF orbitals, the MRCI calculation based on state‐average CASSCF orbitals by Langhoff et al 44 and Sheehy et al 46, as well as the other two also obtained through MRCI calculations by de Vivie and Peyerimhoff 43 and Laux and Kruger 47. An inspection of Table XI reveals good agreement of the MQDO value with the experimental data 39, 40, 48–54, even better than other theoretical results obtained with more complex theoretical procedures.…”

In situ detection of atomic and molecular iodine using Resonance and Off-Resonance Fluorescence by Lamp Excitation: ROFLEX

“…A similarly low fluorescence yield from B( 2 ) (υ = 8) can be expected (Hikida et al, 1983). Energy transfer and electronic quenching of the C, D and B states to the A state by N 2 are fast and enhance A → X fluorescence from 195 nm to 350 nm (Hikida et al, 1983;Imajo et al, 1986;Luque and Crosley, 1999), outside the transmission curve of the 180 nm interference filter used in our instrument. Indeed, at NO levels typical of a polluted environment, we could not detect fluorescence signal attributable to NO.…”

“…NO A → X fluorescence extends down to the spectral range where I 2 fluorescence is collected (240 nm -395 nm) (Hikida et al, 1983;Imajo et al, 1986;Luque and Crosley, 1999). But, again, no interference was observed in a polluted atmosphere.…”

Mode‐to‐Mode Collision Energy Transfer from Vibrationally Excited C6F6 to NO/N2 Mixed Bath with the Development of New Potential Energy Functions

“…[66] In another work, the collisional relaxation of NO was investigated in N 2 /NO mixture. [67] Both these works had different objectives than the ones intended in the present simulation studies. In this article, the collisional intermolecular energy transfer is studied from highly vibrationally excited HFB to NO/N 2 mixed bath equilibrated at 300 K. Accurate intramolecular and intermolecular potential energy parameters are used in this study.…”