Nitrogen molecular spectra in the region from 900A to 2300A have been photographed with a 10-foot vacuum spectrograph giving dispersion of 5.5A/mm. Partial rotational quantum analyses made for several bands $a^{1}\ensuremath{\Pi}_{u}\ensuremath{\rightarrow}{^{1}\ensuremath{\Sigma}_{g}}^{+}$ system yielding constants ${{B}_{0}}^{\ensuremath{'}}=1.632\ifmmode\pm\else\textpm\fi{}0.002$, ${{B}_{0}}^{\ensuremath{'}\ensuremath{'}}=1.998\ifmmode\pm\else\textpm\fi{}0.002$,...

Vibrational relations.---Formulas for the heads of bands are: $\mathrm{Green} {\mathrm{Na}}_{2}: \ensuremath{\nu}=20301.62+(123.84{n}^{\ensuremath{'}}\ensuremath{-}0.79{n}^{\ensuremath{'}2})\ensuremath{-}(157.57{n}^{\ensuremath{'}\ensuremath{'}}\ensuremath{-}0.57{n}^{\ensuremath{'}\ensuremath{'}2})$ $\mathrm{Red}...

With an all-metal "Trennschaukel" of the type recently developed by Clusius and Huber, consisting 22 tubes interconnected single capillaries, with gas oscillating a period 15 sec, we have measured thermal diffusion factor $\ensuremath{\alpha}$ for all noble gases as function temperature in range 230\ifmmode^\circ\else\textdegree\fi{}K-600\ifmmode^\circ\else\textdegree\fi{}K. The reduced factors ${\ensuremath{\alpha}}_{0}$ krypton xenon are positive even at lowest increase so markedly to...

A BeH band system analogous to the $B^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}X^{2}\ensuremath{\Sigma}$ MgH is reported. Observed bands are (0,0) at 1960A, (1,0) 1882A and (1,1) 1956A. Each consists of a single $Q$ branch (negligible spin doubling), $P$ $R$ transitions being eliminated by predissociation from $^{2}\ensuremath{\Pi}$ state into neighboring unstable $^{2}\ensuremath{\Sigma}$ state. For ${B}_{0}=10.65$ ${\mathrm{cm}}^{\ensuremath{-}1}$...

With a metallic strontium arc in hydrogen atmosphere as source, high dispersion spectrograms of three groups bands the near infrared with main heads at 7020A, 7347A and 7508A have been obtained. Analysis shows that latter two constitute $^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ system only (0, 0) (1, 1) vibrational transitions, while first group represents transition from higher $^{2}\ensuremath{\Sigma}$ to same normal state. Quantum analyses give for state...

Two new band systems appear in a Be arc hydrogen, one the green from 4800A to 5120A, other 3700A beyond 2200A ultra-violet. Measurements of bands both at high dispersion are reported, and quantum analysis is given. The group belongs probably $^{2}P\ensuremath{\rightarrow}^{2}S$ class due BeH molecules. It consists 0-0, 1-1, 2-2, etc., bands, degrading violet, but all branches exhibit marked shift red for $j>30$. gives...

The spectrum of calcium deuteride has been photographed at high dispersion with a Ca arc in an atmosphere heavy hydrogen as source. Quantum analyses the $B$ and $C$ systems are presented, rotational energy constants spin doubling two states bands compared those for CaH. ratio $\frac{{{B}_{e}}^{i}}{{B}_{e}}$ ground state is 0.51337 whereas reduced masses 0.51276. This represents decrease 0.059 percent equilibrium internuclear distance CaD. $B ^{2}\ensuremath{\Sigma}$ CaD does not show...

An intense spectrogram of the $\ensuremath{\lambda}4991$ BeH band has been obtained in third order a 21-foot concave grating with dispersion 1.286A per mm. Every $P$ and $R$ line (0, 0) strong interval ${K}^{\ensuremath{'}\ensuremath{'}}=6 \mathrm{to} 20$ is accompanied by very weak position calculated for ${\mathrm{Be}}^{8}$H, except where another branch prevents measurement. The relative intensities ${\mathrm{Be}}^{8}$H ${\mathrm{Be}}^{9}$H lines are about 1:2000. Discussion shows this to...

The $E$ band system of CaH at 4900A is shown to be the $\ensuremath{\Delta}v=0$ sequence a $^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ transition, lower state being normal $^{2}\ensuremath{\Sigma}^{+}$ state. Quantum analysis gives for $E$, $^{2}\ensuremath{\Pi}$ ${B}_{0}=4.2844$, ${D}_{0}=\ensuremath{-}2.16\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, $A=9.3$, $\ensuremath{\gamma}=+0.230$ $K<20$, ${\ensuremath{\omega}}_{0}=1248.6$ and...

Rotational term data for the green MgH bands.---The values of rotational terms vibrational states \textonehalf{}, $\frac{3}{2}$, and $\frac{5}{2}$ in bands are tabulated.Analytical representation terms. The Kratzer, Kramers Pauli formula is applied to with following giving best fit: ${{j}^{\ensuremath{'}}}_{min}=\frac{1}{2}$, ${{j}^{\ensuremath{'}\ensuremath{'}}}_{min}=\frac{1}{2}$, ${\ensuremath{\sigma}}^{\ensuremath{'}}=\frac{1}{2}$, ${\ensuremath{\sigma}}^{\ensuremath{'}\ensuremath{'}}$...

A BaH band system with principal heads at 8924A and 9017A degraded to the red is $^{2}\ensuremath{\Sigma}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ same lower $^{2}\ensuremath{\Sigma}$ as for $^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ bands in visible region. For upper state ${B}_{0}=3.232$, ${D}_{0}=\ensuremath{-}1.323\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ ${\ensuremath{\gamma}}_{0}=\ensuremath{-}4.84$. This very large spin doubling...

The effects of foreign gases (A, ${\mathrm{N}}_{2}$ and ${\mathrm{H}}_{2}$) on the $D$-lines Na have been studied by means a steel absorption chamber, in which Na-vapor pressure is kept low while gas varies between 0 17 atmospheres. Temperatures were such that true line contours could be photographed photometrically evaluated. Results are: (1) red shift maximum linearly with density perturbing gas. (2) Study reveals marked asymmetries, most pronounced near base. Asymmetries are to case A...

The isotope shift and the ${\mathrm{Pb}}^{207}$ h.f.s. in nine of strongest PbI lines violet ultraviolet regions have been measured, using material enriched 204 isotope. For all with measurable structure 204-206 interval is less than 206-208 interval. In resonance line $\ensuremath{\lambda}2833$ $\ensuremath{\lambda}3639$, for both which measurements are almost completely unaffected by superposed h.f.s., ratio to 0.89 0.82 respectively. average our observations others staggering center...

In a thermal diffusion apparatus consisting of two concentric vertical metal cylinders the temperature inner hot cylinder is measured for constant power input in heater as function pressure contained gas (${\mathrm{N}}_{2}$ or C${\mathrm{O}}_{2}$). The change from lamellar convection flow to turbulence produces sharply at certain cooling which increases with further rise density. For this critical density ratio remixing by that well Reynolds numbers are computed. latter around 150; i.e.,...

The analyses of the $B$ and $C$ band systems SrD a portion $D$ system SrH are presented. $B_{e}^{*}=1.9427$ for 3.8788 normal $^{2}\ensuremath{\Sigma}$ state. ratio these, 0.50635, shows about expected departure from equality with ${\ensuremath{\rho}}^{2}=0.50603$ reduced masses. spin doubling this state is regular, ${\ensuremath{\gamma}}_{0}=+0.0613$ being almost exactly in ${\ensuremath{\rho}}^{2}$ value SrH. $B^{2}\ensuremath{\Sigma}$ departs markedly usual linear variation...

A rather complex spectrum of InO lying between the two In resonance lines at 4102A and 4511A is described. Most band heads are assigned to a $^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ system with frequencies main (${R}_{2}+{Q}_{2}?$) given by formula...

New SrH band systems photographed at high dispersion include: (1) an abbreviated $C^{2}\ensuremath{\Sigma}\ensuremath{\rightarrow}N^{2}\ensuremath{\Sigma}$ system with (0,0) head 3808A, (2) a many-lined $D^{2}\ensuremath{\Sigma}\ensuremath{\rightarrow}N^{2}\ensuremath{\Sigma}$ between 5000A and 6700A, (3) $E^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}N^{2}\ensuremath{\Sigma}$ consisting of $\ensuremath{\Delta}v=0$ sequence only the 5323A. The (0,1) $C$ bands have three violent perturbations...

Quantum analyses of the (1,0), (1,1) and (2,1) bands infrared $^{2}\ensuremath{\Sigma}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ system BaH some details $^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ band at 10,300A are presented. The spin doubling constant $\ensuremath{\gamma}$ upper $^{2}\ensuremath{\Sigma}$ state is very large (-4.88) decreases with increasing molecular rotation, $A\ensuremath{\cong}625$ ${\mathrm{cm}}^{\ensuremath{-}1}$ for...

Measurements of spectrograms the ultraviolet S${\mathrm{O}}_{2}$ absorption bands taken at different pressures, tube lengths and temperatures together with known infrared Raman frequencies serve to locate three fundamental vibrational series. Tables giving band assignments these sequences are included. The lower state for infinitesimal amplitude 1369, 1164 610 ${\mathrm{cm}}^{\ensuremath{-}1}$, while excited corresponding 341, 387 290 ${\mathrm{cm}}^{\ensuremath{-}1}$. types addition series...

The Zeeman effect in the red $^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ and $^{2}\ensuremath{\Sigma}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$ CaH bands, together with new satellite branches system, are reported. Field strengths up to 30,000 gauss were employed, dispersion of large concave grating a parallel light mounting being about 2.1A per mm.Satellite series bands.---The $^{0}P_{12}$ measured for both $A$ ${A}^{\ensuremath{'}}$ bands. These frequencies...

The isotopic thermal diffusion factor for He, Ne, and Ar has been measured by an all-glass ``swing separator'' with its lower tube ends at 78° 195°K, extending the temperature range of earlier data. These new data, along older ones, have interpreted in terms L-J (12–6) modified exp-six potentials. Various equilibrium nonequilibrium properties are calculated compared experimental An equation developed which relates absolute values viscosity, coefficient, their derivatives is essentially...

Under bombardment by 2.6-Mev deuterons, neon is observed to emit a large yield of protons which fall into at least four groups energy change values 1.02, 2.15, 3.13, and 4.88 Mev. To assign these the appropriate isotope, samples enriched in ${\mathrm{Ne}}^{22}$ ${\mathrm{Ne}}^{20}$ prepared thermal diffusion method were bombarded with result that all are found correspond excited states ${\mathrm{Ne}}^{21}$. The reaction involved ${\mathrm{Ne}}^{20}(\mathrm{dp}){\mathrm{Ne}}^{21}$. maximum...

A BaH band with principal head at 10,052A degraded to the red is $(0,0)^{2}\ensuremath{\Pi}_{1\frac{1}{2}}\ensuremath{\rightarrow}^{2}\ensuremath{\Sigma}$, lower state being same as for other systems. ${{B}_{0}}^{*}=3.280$, ${D}_{0}=\ensuremath{-}1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\ensuremath{\Lambda}$- doubling large negative. This $^{2}\ensuremath{\Pi}$ well upper $^{2}\ensuremath{\Sigma}$ 8924A must be derived from Ba $^{3}P+\mathrm{H}^{2}S$. The origin of a...