A. Antić-Jovanović

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.

The A1Π-X1Σ band system of CD+: Spectroscopic constants and isotope shifts

Abstract Six bands of the A1Π-X1Σ system of CD+ in the region 3800–4800 A have been recorded in emission using an aluminum hollow-cathode discharge in the HeC2H2 mixture. From the vibrational and rotational analysis of the observed bands, the following constants (cm−1) are obtained: T 00 ω e ω e x e ω e y e B e D e ·10 4 α e A 1 Π 23 747.5 1367.3 60.6 0.75 6.428 5.7 0.388 X 1 Σ 0 2035 7.650 4.1 0.190 (2101.6) (33.3) Δ G 1 2 ; (ωe), (ωexe) are calculated from isotope relation. The electronic isotope shift Δρ e i = T e ( CH + ) − T e ( CD + ) = −13 cm −1 has been derived according to the theoretical expression given by Bunker. A somewhat smaller value was obtained from the pure electronic energy difference using “experimental” values of the zero point energies.

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.

Raman Spectral Study of Magnesium-Solvent Interaction in Acetone Solution

Abstract Raman spectra have been used to investigate the cation-solvent interaction in acetone solution of Mg(CIO4)2. Analysis of the bands of C=O and C-C valence vibrations of acetone and the totally symmetric vibration of CIO4 ion led to the identification of different magnesium-acetone associations. The stability of the formed solvate species has been tested by adding NaSCN to solution. It is found that all bands arising from the solvated acetone molecules to the Mg2+ ion are changed in the presence of NaSCN and the new bands, attributed to the other species, occur. Formation of the magnesium-isothiocyanato complexes in solution has been supported by the analysis of the symmetric stretching ν1 (C-N) vibration of the SCN ion.

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.

An Investigation of the Digitized Raman Band Profiles of Aqueous Mg(ClO4)2 - NaSCN Solutions

Abstract Raman spectra, together with factor analysis and band deconvolution procedure, have been used to study formation of magnesium thiocyanate complexes in aqueous solutions at ambient and elevated temperatures. The total salt concentration in solutions, containing different mole ratio of Mg2+ to SCN, varied between 3.4 and 7.5 mol dm−3. Factor analyses indicated that two linearly independent scattering components in the band envelopes, recorded in the V1 and v3 stretching regions of SCN, for all solutions with total salt concentration of 3.4 mol dm−3. The appearance of a pseudo-isosbestic point in the area normalized spectra supported this result, as well as the baud resolution procedure. The latter revealed the third scattering component in the spectra of solutions with total salt concentration above 3.5 mol dm−3 Resolved components have been assigned to the free thiocyanate, the 1:1 and 1:2 magnesium thiocyanate complexes. The equilibrium constant Kc of the 1:1 complex is of an order of 10−1 mol dm−3.