Line shifts in the first overtone of DF broadened by HF

Line spectra shifts in HF and in first overtone band of DF induced by HF pressure

THE ANGULAR DISTRIBUTION OF ALPHA-PARTICLES SCATTERED BY SILVER, COPPER, AND ALUMINUM

Abstract not availabl

COMBINATION BANDS OF D2OD_{2}O AND HDO∗HDO^{\ast}

Author Institution: National Bureau of Standards; The Johns Hopkins UniversityThe absorption spectra of $D_{2}O$ and mixtures of heavy and light water vapor have been measured between 1.2 and $2.8 \mu$. With the 15,000 line/inch grating, effective slits of about $.15 cm^{-1}$ could be used, resulting in considerably better resolution and greater detail than in any previously reported bands of $D_{2}O$ and HDO. A multiple reflection cell with a path of 6 meters was used, heated to about $70^{\circ}C$ in order to increase the density of the absorbing molecules. The analysis of the 101 and 111 bands of $D_{2}O$ at 5373.6 and $6533.4 cm^{-1}$, respectively, have been verified and $extended^{1,2}$ and we have observed and analyzed two new bands of this molecule, 011 at $3956.3 cm^{-1}$ and 201 at $7899.7 cm^{-1}$. The analyses have been extended to higher J-values than in previous work and yields improved rotational constants. We have also observed and measured a number of lines attributed to be HDO molecule, particularly in the regions centering about $4105 cm^{-1} (\nu_{1} + \nu_{2}$) and $5103 cm^{-1} (\nu_{2} + \nu_{3}$) and $6460 cm^{-1}$. The rotational analysis of these bands is in progress and will be reported on

VERY HIGH ELECTRIC FIELD INDUCED PURE ROTATION SPECTRUM OF HYDROGEN.

Author Institution: Department of Physics, University of Tennessee; Sandia Corporation Alburquerque, New Mexico, 87103This research was supported by NASA Grants NsG 539 and NGL 43-001-006. Present address of P. J. Brannon: Sandia Corporation, Albuquerque, New Mexico.A new Stark cell capable of producing higher electric field intensities than had been before achieved was built and used to examine the pure rotation infrared spectrum of the hydrogen molecule. The higher field intensities were achieved by the elimination of plastic spacers traditionally used in previous Stark cells between the parallell plate electrodes. Operating field intensities of 200,000 volts/cm are easily obtained in compressed hydrogen at a pressure of 400 p.s.i., compared to a previous maximum of 135,000 volts/cm at 550 p.s.i. in a similar cell. Peak field intensity in the new cell just before breakdown is 240,000 volts/cm in hydrogen at 400 p.s.i. The fundamental vibration-rotation spectrum and the pure rotation spectrum of hydrogen were observed using the new cell. The pure rotation spectrum was measured since it has not been observed before using the electric field induced method. The wave numbers of the $S_{0}(1), S_{0}(2)$ and $S_{0}(3)$ transitions were measured to be $587.079 cm^{-1}, 814.523 cm^{-1}, 1034.765 cm^{-1}$ respectively. These values were used to calculate the molecular constants of hydrogen. The calculated value for $B_{o}$ was 59.332, for $D_{o}: 0.0450$ and for $H_{o}: 3.1 \times 10^{-5}$, in cm$^{-1}$

ELECTRIC FIELD INDUCED SPECTRA OF HYDROGEN, DEUTERIUM, AND NITROGEN

$^{1}$P. A. Jannson, R. H. Hunt, and E. K. Plyler, J. Opt. Soc. Am. 60, 596 (1970).Author Institution: UTMSL, Molecular Spectroscopy Laboratory, Department of Physics and Astronomy, The University of TennesseeThe shifts of the Q-Branch fundamental, electric field induced absorption lines of hydrogen and deuterium have been measured on the new five-meter Littrow spectrometer. The shifts with density are clearly in the linear region and the zero pressure frequencies are calculated. Selected lines in hydrogen have been deconvoluted using the basic method of $Jannson^{1}$ which has been modified. The process of deconvoluting lines has been highly automated using digitally recorded data on magnetic tape and Fortran coded programs. The results of a search for the field induced spectrum of nitrogen will be presented. The Q branch was observed but the absorption with the achievable field was insufficient to enable us to make quantitative measurements

CRITICAL EXPERIMENTS FOR PL-2 AND THEIR ANALYSIS

The critical experiments showed that the original specification of 1.0 wt% for the boron concentration could be reduced to 0.25 wt% without reducing the one-rod-out shutdown margin below 2 1/2% reactivity as measured by rod drop experiments. Good agreement was obtained between calculated and measured eigenvalues for the small, clean cores which were analyzed. In cores with no control rods and containing all fuel, 0.0, 0.25, or 1.1 wt% boronstainless steel, and with all 0.25 wt% boron-stainless steel and fuel elements surrounded by aluminum-water displacers, the calculated eigenvalues were 0.7 to 1.0% greater than the measured values. In a core with 0.25 wt% boronstainless steel and with the center control rod fully inserted, the calculated eigenvalue was 1.0% larger than measured. In one case, a core composed entirely of fuel and with the center control rod fully inserted, the calculated eigenvalue was 0.33% DELTA k smaller than that measured. The calculated power distributions compared extremely well with those measured in the fuel assemblies. Shutdown measured by the boron substitution method, where the worth of the boron was measured by calibrating both a single control rod and a bank of rods, was found to give consistent results which in turn agreed to within 0.5% DELTA k with shutdown measured by the rod drop technique. The rod drop measurements with 0.25 wt% boron gave a shutdown of 2.52% with the central control rod withdrawn. Correcting for the small difference between the mockup and the reference core, the shutdown margin for the PL-2 was 3% DELTA k/k. Shutdown measurements obtained by moving a calibrated control rod from all into its critical position and maintaining criticality by the compensating motion of another rod or rods, were found to give widely differing results depending on the combination of rods used. Measurements in a boron-stainless steel zoned core where the boron-stainless steel poison rods were removed from the outer 12 peripheral subassemblies and replaced with fuel elements, show that the center rod remains the strongest, that the center-rod- stuck-out shutdown margin is reduced very little (--0.28% DELTA k) from the core containing boronstainless steel in all subassemblies, and that 1.09% reactivity is gained at beginning of life by removing this boronstainless steel. (auth

DETERMINATION OF η\eta FOR THE SPECTRAL LINE R (4) OF HYDROGEN FLUORIDE∗FLUORIDE^{*}

$^{*}$Supported by the Air FORCE Cambridge Research Laboratories. $^{\dag}$Supported by the U. S. Naval Postgraduate School.Author Institution: The University of Tennessee“The line shape of pressure-broadened spectral lines can be represented by the modified Lorentz expression $\alpha = \alpha_{o}(\Delta \nu)^{2}[|\nu - \nu_{o}|^\eta + (\Delta \nu)^{2}]^{-1}$. An investigation of the value of $\eta$ for the R(4) spectral line of the fundamental band of HF has been made to determine the variation of as a function of distance from line center. The range $\eta$ was found to be $\eta = 2.00$ for $|\nu - \nu_{0}| 3 cm^{-1}$, and n varies linearly from 2.00 to $1.82 \pm .03$ for $2 cm^{-1} < | \nu - \nu_{o}| < 3 cm^{-1}$.