Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium

Optimal set of 1050 rovibronic energy levels for 35 triplet electronic states of $D_2$ has been obtained by means of a statistical analysis of all available wavenumbers of triplet-triplet rovibronic transitions studied in emission, absorption, laser and anticrossing spectroscopic experiments of various authors. We used a new method of the analysis (Lavrov, Ryazanov, JETP Letters, 2005), which does not need any \it a priory \rm assumptions concerning the molecular structure being based on only two fundamental principles: Rydberg-Ritz and maximum likelihood. The method provides the opportunity to obtain the RMS estimates for uncertainties of the experimental wavenumbers independent from those presented in original papers. 234 from 3822 published wavenumber values were found to be spurious, while the remaining set of the data may be divided into 20 subsets (samples) of uniformly precise data having close to normal distributions of random errors within the samples. New experimental wavenumber values of 125 questionable lines were obtained in the present work. Optimal values of the rovibronic levels were obtained from the experimental data set consisting of 3713 wavenumber values (3588 old and 125 new). The unknown shift between levels of ortho- and para- deuterium was found by least squares analysis of the $a^3\Sigma_g^+$, $v = 0$, $N = 0 \div 18$ rovibronic levels with odd and even values of $N$. All the energy levels were obtained relative to the lowest vibro-rotational level ($v = 0$, $N = 0$) of the $a^3\Sigma_g^+$ electronic state, and presented in tabular form together with the standard deviations of the empirical determination. New energy level values differ significantly from those available in literature.Comment: 46 pages, 9 picture

THE LYMAN AND WERNER BANDS OF D2D_{2}

Author Institution: Division of Physics, National Research Council of CanadaThe emission spectrum of $D_{2}$ in the vacuum ultraviolet has been re-investigated in the third order of a 10 m vacuum spectrograph. New rotational and vibrational constants for the ground state of $D_{2}$ have been evaluated which will make possible a more critical check of the results of ab initio calculations. Similar improved constants for the excited states have also been obtained

A laboratory determination of the frequency of the 10-centimeter radio line of CH by optical measurements

Peer reviewed: YesNRC publication: Ye

Rotational analysis of the a3Πr-X1Σ+ transition of AlI

The a3Πr-X1Σ+ transition of Al I has been analyzed for the first time. Accurate rotational and vibrational constants are given for the a3Πr electronic state

NEW STUDY OF THE EMISSION SPECTRUM OF SiF

Author Institution:The emission spectrum of SiF has been studied rotationally between 1750 and 5500 {\AA}. Equilibrium constants for the A, B and C states have been refined. Rydberg states observed up to now at low resolution have also been rotationally analysed. Eight new Rydberg states have been observed; for six of them rotational constants are given

Fourier transform infrared spectrum of FCN: The 1800-2800 cm(-1) spectral range

The infrared spectrum of cyanogen fluoride (FCN) in the 1800 to 2800 cm(-1) region has been recorded with a Fourier transform spectrometer at an instrumental resolution of 0.0026 cm(-1). A total of 6822 absorption lines have been measured with an accuracy better than 6 x 10(-4) cm(-1). Forty-nine bands of (FCN)-F-19-C-12-N-14, twelve of (FCN)-F-19-C-13-N-14, and four of (FCN)-F-19-C-12-N-15 have been analyzed. For these bands, the band origins and rotational constants B-v, D-v, H-v, and L(v) as well as q(v), q(Dv), and q are reported. We have also detected for the first time a perturbation in the 30 degrees 0 vibrational state. This perturbation is interpreted as due to an indirect effect of the two first-order anharmonic resonances between 30 degrees 0 and 02 degrees 1. (C) 1997 Academic Press, Inc

Ft Infrared-spectra of Clcn Between 1200 and 5000 Cm(-1) and Global Rovibrational Analysis of the Main Isotopomers

High-resolution Fourier transform spectra of ClCN in the 1200-2140 and 4000-5000 cm(-1) spectral regions have been recorded to measure the line positions for the nu(1) + 2 nu(2), 2 nu(1), 4 nu(2), nu(3) - nu(2), 2 nu(3), and nu(2) + 2 nu(3) bands and some associated hot bands. A total of 13 bands have been observed for (ClCN)-Cl-35-C-12-N-14, and 6 for (ClCN)-Cl-37-C-12-N-14. We report also the analysis of 20 new bands identified in previously studied regions (8 for (ClCN)-Cl-35-C-12-N-14, 9 for (ClCN)-Cl-37-C-12-N-14, and 1 each for (ClCN)-Cl-35-C-12-N-15, (ClCN)-Cl-37-C-13-N-14, and (ClCN)-Cl-37-C-12-N-15). A global analysis has been applied to (ClCN)-Cl-35-C-12-N-14 and (ClCN)-Cl-37-C-12-N-14 on the basis of all data (microwave, radiofrequency, and infrared) available for energies in their electronic ground state. A statistical agreement is obtained with the whole set of data and a set of 80 molecular parameters have been determined for the two isotopomers. Effective constants and their uncertainties have been calculated up to the eighth order in J(J + 1) for vibrational levels up to more than 5000 cm(-1). (C) 1995 Academic Press, Inc