Internal energy distributions from nitrogen dioxide fluorescence. 2. Collisional energy transfer from excited nitrogen dioxide
- Univ. of California, Berkeley, CA (United States) Lawrence Berkeley Lab., CA (United States)
We follow the collisional deactivation of laser-excited nitrogen dioxide through its dispersed fluorescence. The energy acceptor gases are NO[sub 2] at four excitation energies ranging from 18828 to 24989 cm[sup [minus]1] and five monatomic gases, four diatomic gases, and three polyatomic gases with 18828-cm[sup [minus]1] excitation energy. The nominal products are the shapes of the internal energy distributions, which are obtained and plotted for several representative cases. From these distributions, the first three moments of the internal energy distributions are derived as a function of molecular collisions and tabulated as (i) the average internal energy, (ii) energy spread, and (iii) skewness. These quantities are plotted against c(M)t, the product of buffer gas concentration c(M) and delay time after laser excitation t(0.5-2 [mu]s), which is a quantity proportional to number of collisions. The negative slope of average energy vs c(M)t is the macroscopic energy-transfer rate constant, k[sub [epsilon]](M). Average energies (E) for all NO[sub 2]-buffered data taken at four excitation wavelengths are well represented by the single equation, fourth order in energy: d(E)/d(c[sub NO(2)]t) = [minus]k[sub 4](E)[sup 4], where k[sub 4] = 8.06 [times] 10[sup [minus]25] (cm[sup 3])[sub energy] molecule[sup [minus]1] cm[sup 3] s[sup [minus]1]. 32 refs., 16 figs., 7 tabs.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5424624
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 97:39; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NITROGEN DIOXIDE
FLUORESCENCE SPECTROSCOPY
ENERGY TRANSFER
EXCITED STATES
FLUORESCENCE
LASER RADIATION
LENNARD-JONES POTENTIAL
MOLECULE COLLISIONS
VIBRATIONAL STATES
CHALCOGENIDES
COLLISIONS
ELECTROMAGNETIC RADIATION
EMISSION SPECTROSCOPY
ENERGY LEVELS
LUMINESCENCE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POTENTIALS
RADIATIONS
SPECTROSCOPY
400201* - Chemical & Physicochemical Properties
400500 - Photochemistry