V. Bojović

Electronic Bands of the BeOH and BeOD

Abstract The electronic bands appearing in the region 300–330 nm were produced in a low-pressure DC are with beryllium electrodes. The bands were obtained in the atmosphere of ordinary water vapour and heavy water vapour. From isotope shift studies, experimental conditions and the similarity with the bands of isoelectronic BeF, the emitting molecules were identified as BeOH and BeOD, respectively.

Vibrational Analysis of the β System of 10B18O

Ten bands of the β system (B2Σ+ − X2Σ+) of the 10B18O molecule have been observed for the first time. The spectrum was obtained by emission spectroscopy from a low‐pressure arc, at medium dispersion, and vibrationally analyzed using isotope shift measurements. Vibrational analysis gave the constants ωe and ωexe for both electronic states involved in the transitions.

New Bands of the Isotopic GaO Molecules

The new bands of the B 2 Σ + -X 2 Σ + system (330-420 nm) of 69 Ga 16 O, 69 Ga 18 O, 71 Ga 16 O and 71 Ga 18 O molecules have been obtained in a low-pressure arc. The vibrational constants ω e , ω e x e and ω e y e for all isotopic species have been derived for both states included in transition. Intensity distribution of the bands in the system have been verified by Franck-Condon factors

The A1π - X1∑ Emission Bands Of 13CH+

Abstract The A1π - X1∑ system of 13CH+ have been observed in the emission spectrum of a hollow cathode discharge through He-13C2H2 mixture. The analysis of the bands yields the following constants in cm−1: B ″ O = 13.866, ΔG ″ 1/2 = 2731.8, B ′ O = 11.365, ω′ e = 1860.0, ω′ e x ′ e = 115.2, ω′ e y ′ e = 2.6. The R (0) lines of the 0—0 and 1—0 bands coincide with those found in absorption spectrum of ζ Oph, thus proving that they are due to the interstellar 13CH+.

Rotational Analysis of the B2Σ+-X2Σ+ Bands of 12C18O+

Abstract The emission spectrum of the B2Σ+-X2Σ+ (First Negative) system of the molecular ion 12C18O+ have been photographed at a resolution sufficient to observe the spin splitting of the lines with N > 18. Four bands, 0-1, 0-3, 1-4 and 2-5, have been rotationally analyzed and the molecular constants of the B2Σ+ , v = 0,1, 2 and X2Σ+ , v =1, 3, 4, 5 have been obtained.

Franck-Condon factors and r-centroids for the E 1Πu-X 1Σ g + system of Ag2

An array of Franck-Condon factors and r-centroids is reported for the bands of the E1Πu-X1Σg+ system of the Ag2 molecule. Both parameters were calculated using the Morse and Rydberg-Klein-Rees potentials. The results showed a reasonable agreement between the two sets of data for transitions, including lower vibrational levels (v ≤ 6). Differences appear with increasing v, but two sets of calculated Franck-Condon factors follow the same pattern. The predicted intensity distribution was compared with the estimated band intensity in the experimental spectrum.

Vibrational Structure of the B—X System of Isotopic Ago Molecules

Abstract Spectra of 107Ag18O and 107Ag16O molecules have been obtained in a low-pressure arc in oxygen atmosphere, and recorded with medium dispersion. Vibrational assignments for the bands of B 2π —X2π system were verified by the study of the oxygen isotope effect, and the vibrational constants were obtained for the states involved in transitions.

Rotation Analysis of the B-X 0-1 Bands of GaO

Abstract The 0-1 band of the B2Σ+-X2Σ+ system of 69Ga16O and 71Ga16O has been measured and rotationally assigned. Principal molecular constants (T01, B0′, B1″, Be″, D0′, D1″, αe″) have been obtained.

High-Resolution Spectra of the 10B18O and 11B18O: Rotational Analysis of the B–X Bands

Emission spectra of 10B18O and 11B18O isotopomers in the 230–330 nm region have been investigated by means of conventional high-resolution spectroscopy. The molecules were produced in a low-pressure arc by discharging 8 Torr of mixture containing argon and oxygen 18 in the ratio of 4:1 and the spectra have been recorded using Ebert-type spectrograph. The boron needed to produce BO has been present in the system as amorphous powder with natural abundance of 10B and 11B. Rotational analysis of the 0, 0 and 0, 1 bands has been performed and spectroscopic constants have been extracted. The results have allowed first determination of the equilibrium rotational constants Be and De for both isotope species 10B18O and 11B18O in their lower electronic state. Assuming a linear dependence of Be on (ν+1/2), the value of equilibrium distance re in the lower state has been derived.

Blue (A-X) System of 107Ag18O Molecule

Abstract The blue A2II-X2II emission system of the 107Ag18O molecule excited in a low-pressure arc, was recorded in the region 400–475 nm with medium dispersion. The vibrational analysis, supported by isotope shifts study, of the red-degraded bands has been made. The final set of the improved 107Ag16O and the new 107Ag18O vibrational constants of the two sub-systems involved in transition are determined.