Study of nitrate radical by laser-induced fluorescence

Abstract

t-Bu),BzN(O)nitrobenzyl bromide, 100-11-8; p-nitrobenzyl duryl nitrodide, 84802-29-9; methyl iodide, 74-88-4; N-methyl-N-tris(tert-bu-ty1)phenyl nitroxide radical, 33721-34-5; N-methoxy-N-tris-(tert-buty1)phenyl anilino radical, 64191-72-6; benzyl bromide, electrochemical cell. CHZ(CBHJNO2,,BzN(O)H,The nitrate radical, NO3, was directly detected by the laser-induced fluorescence method. The band structure of the fluorescence excitation spectrum was consistent with that of the absorption spectrum. The fluorescence spectrum excited at 662 nm corresponding to the 0-0 transition showed progressions with 1060-and 1480-cm-' intervals, which were assigned to the symmetric stretching (vl) and degenerate antisymmetric stretching (v3) modes of the ground state NO,, respectively. The fluorescence lifetime excited at the 0-0 band was estimated to be 2.8 ~s from the Stern-Volmer plots in the pressure region of 0.04-0.6 torr.(9) J. R. McDonald, private communication. Geophys. Res. Lett., 7 , 89 (1980).Perturbations around steady states of a system of cerium or manganese bromide and bromate ions in a sulfuric acid solution, in a continuous stirred tank reactor (CSTR), are investigated. Two kinds of perturbations are discussed, namely, small-species and large-constraint ones. The feasibility of measuring a particular rate constant by following the system behavior after a small perturbation is analyzed. Some general theorems regarding this behavior are obtained. Large perturbations, namely, those that cause a transition of the system from one steady state to another, are analyzed and an approximate relationship between the perturbations' intensity and length is developed. The results are in good agreement with the experimental data.

Optically‐detected magnetic resonance of molecular color centers CO3– and NO3 in gamma‐irradiated beryl

“…It showed that the symmetry of the split excited states that govern the transition probabilities for right and left circular polarization in the MCDA spectra are inverted for the CO 3 -compared to the NO 3 . Table 1 show a comparison of the vibrational modes for NO 3 and CO 3 -radicals in beryl as estimated in this work from the MCDA spectra, with those of free NO 3 radicals detected by Laser-induced fluorescence after decomposition of nitric acid vapor [10,11]. For the CO 3 -radical only values for a non-axial symmetry were found in the literature.…”

Communication: MULTIMODE calculations of low-lying vibrational states of NO3 using an adiabatic potential energy surface

“…It has been the focus of a large body of spectroscopic work due to its complexity and difficulty in making state assignments. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Theoretically, numerous papers have appeared dealing with various aspects of the electronic structure and vibrational analysis [15][16][17][18][19][20][21] and we refer the reader to those papers for details. We note that theoretical work on vibrational assignments done by Stanton has used a model vibronic Hamiltonian, developed by Köppel−Domcke−Cederbaum, 22 with high-level ab initio input and some empirical scaling of the diabatic coupling to obtain good agreement with experiment.…”

Charged and Neutral NO3 Isomers from the Ionization of NOx and O3 Mixtures

“…The peculiar features of the NO /O 3 and NO 2 /O 3 systems, deduced from the combination of our experimental and theoretical results, are illustrated in the energy profiles of Figures 9 and 10. Starting from NO , both the O 2 -and O-transfer reactions (10) and (11) …”

“…NO 3 . was produced in situ by reaction of NO 2 with O 3 , according to an established procedure, [10] and ionized by low-energy (40 eV) electron ionization (EI). The CAD spectrum, shown in Figure 3a, displays wide Gaussiantype peaks of m/z 46 (NO 2 ) and m/z 30 (NO ), consistent with the expected O-NO 2 connectivity.…”