Coaxial measurement of the translational energy distribution of CS produced in the laser photolysis of CS2 at 193 nm
Explore the source record for details and available documents.
Mccrary, V. R.↗
Engineering topics
Halpern, J. B.
Publications and source records attributed to Halpern, J. B..
Two photon excitation as a tool for atmospheric and kinetic research
Progress was made in the following areas: two photon excitation cross section of hydroxyl, marker fringe generation of deep UV and VUV radiation, and CN radiative lifetimes.
Halpern, J. B.↗
Vacuum UV laser induced scission of Simian virus 40 DNA
Explore the source record for details and available documents.
Johnson-Thompson, M.↗
Scanning delay generator for measurement of kinetic decays using laser-induced fluorescence techniques
An electronic device is described which generates a delayed pulse, where the delay is increased in a step-like manner. This device finds application in the measurement of kinetic decays, particularly when laser-induced fluorescent (LIF) detection of the decaying species is used. The circuit uses 15 low-power Schottky TTL chips and is contained within a dual width NIM module.
Halpern, J. B.↗
Production of CS and S in Comet Bradfield /1979 X/
High and low resolution ultraviolet spectra of carbon monosulfide (CS) in Comet Bradfield (1979 X) were obtained with the IUE satellite. The high resolution rotational profile of the (0, 0) band at 257.5 nm can be fitted with a theoretical profile derived assuming a Boltzmann temperature of 70 K. Spatial plots of the low resolution data for both S and CS show that these emissions are concentrated toward the cometary nucleus. The results that have been obtained are consistent with a Haser model for CS and S where the parent molecule is CS2. A very rapid variation of CS brightness with heliocentric distance is found.
Jackson, W. M.↗
Partitioning of excess energy in the photolysis of cyanogen chloride and cyanogen bromide at 193 nm
The nascent quantum state distributions of CN(X2 Sigma +) fragments produced in the dissociation of ClCN and BrCN by photolysis at 193 nm, in an effusive beam, have been measured. The rotational distribution of the fragments is highly excited. The results show that the excited electronic state which dissociates is bent. A simple parameterization is shown to fit the results. This parameterization is based on a semiclassical model which has dynamical implications.
Halpern, J. B.↗
Vibronic effects in the predissociation of the C/1/Pi/u state of C2N2
The partitioning of excess photochemical energy as a function of the vibrational energy of the state of C2N2 has been measured. Surprisal theory has been used to analyze the data and it shows that complete randomization does not occur before dissociation. The results are also inconsistent with the predictions of the quasidiatomic theory for photodissociation.
Miller, G. E.↗
Tunable VUV photofragment monochromator
A versatile tunable VUV photofragment monochromator is described. The instrument uses a unique flashlamp and a single slit monochromator to produce the photofragments. A tunable dye laser is used to detect these fragments via laser induced fluorescence. The results of preliminary design parameter measurements are presented along with the first photofragment spectra obtained with this instrument. It is shown that the SNR is adequate to assign single quantum state photofragment distributions.
Miller, G. E.↗