Survey of Vibrational Relaxation Data for Processes Important in the CO2-N2

Nitrogen Vibrational Population Measurements in the Plenum of a Hypersonic Wind Tunnel

“…17 cm 3 =s at room temperature [26]. The characteristic time for nitrogen V-V relaxation at these conditions VV 1=k VV n O2 10 ms at P O2 50 torr is longer than the flow residence time between the injection location and the CARS measurement region, estimated to be res 2:0 ms.…”

“…Carbon dioxide injection, which results in significant reduction of nitrogen vibrational temperature, even at low CO 2 mole fractions in the flow, illustrates the other extreme. The room temperature rate coefficient for V-V energy transfer is very rapid, k VV 6 10 13 cm 3 =s [26] ( VV 1=k VV n CO 2 10 s for CO 2 partial pressure of only 5 torr). CO 2 vibrationally excited in collisions with nitrogen relaxes via rapid intramolecular V-Venergy transfers to 2 (010) and 1 (100) modes, with subsequent rapid V-T relaxation.…”

DNA Chemistry Panel Review. CO2

“…64) supplemented with a few additional ones involving certai-ion-molecule reactions. Table 1 (1) where the constants a, b, c are given in Table 1. Two-body reaction rates have units cm 3 particle -'sec-'; three-body rates have units cm 6 particle -2 sec -1 .…”

“…These parameters are: chemical rate-coefficient values (or expressions) for formation/destruction of C0 2 , rates for collisional excitation/deexcitation of certain vibrational states and optical parameters including frequencies, Einstein A coefficients and pB factors for bands of CO 2 originating from vibrational levels up to about 5000 cm 1 .…”

Monte Carlo Simulation of Negative Ion Collection by a Rocket-Borne Mass Spectrometer

“…The reason for choosing steam is that it has 12 an anomalously rapid vibrational relaxation rate for V-T collisions. The scatter in the data is such that the temperature exponent is uncertain and a constant value of 3.5 x 0-m 3 s-lper molecule has been used for the deactivation rate.…”