L-E Berg

Rotational Analysis of the A-X and B-X Band Systems of CaH

The absorption spectrum of CaH in the region 6 130-7 125 A has been generated using a King furnace. The spectrum was recorded photographically in a 10.685 m concave grating spectrograph. Ten bands belonging to the A2Π-X2Σ and B2Σ-X2Σ systems have been rotationally analyzed. Perturbations between the two excited states have been observed. Computer methods have been used to calculate term values and to evaluate molecular constants.

Laser Spectroscopic Investigations of CaCl

Laser excitation and fluorescence spectra of the A2Π–X2Σ transition of gaseous calcium chloride have been observed and analyzed. Traditional absorption spectra were also recorded in a high-resolution spectrograph. Totally 1949 rotational lines were used in the calculations and the following molecular equilibrium constants (cm-1) were determined by least squares methods. The numbers in parentheses represent one standard deviation in the last digit

Laser Spectroscopic Investigations of CaCl. II. Rotational Analysis of the B2Σ- X2 Σ Transitions

Diatomic calcium chloride has been examined by means of laser excitation and fluorescence spectroscopy. A small resistance furnace and a c.w. Rhodamine 6G dye laser were used to produce the spectra. The absorption spectrum of CaCl was also recorded by using a 5 m Jarrel Ash spectrograph. The following rotational and vibrational constants of the B2Σ and X2Σ states have been derived (cm-1): B2Σ+ X2Σ+ Te 16 856.684(4) 0.0 ωe 367.196(6) 370.201(1) ωexe 1.524(2) 1.3732(1) ωeye 8.6(2) × 10-3 9.3 × 10-3 ωeze -3.8(2) × 10-4 -4.8(2) × 10-4 Be 0.154 704(1) 0.152 233 αe 8.835(3) × 10-4 7.92 × 10-4 De 1.1409(4) × 10-7 1.068 × 10-7 γe -6.531(7) × 10-2 1.38 × 10-3 γD 1.36(6) × 10-7 0.0 αγ -4.0(6) × 10-4 0.0 The figures in parentheses stand for one standard deviation in the last digit for the computed quantity.

Lifetime measurements of CaCl, CaBr and SrCl

A time-resolved laser resonance experiment is presented in which the B 2Π+ states of the CaBr, CaCl and SrCl monohalides are reinvestigated by means of the delayed coincidence method. The lifetimes measured for CaCl and CaBr differ compared to results found in the literature. The following lifetimes were obtained or the B 2Π+ states: CaCl 44·8 ± 0·9 ns, CaBr 48·9 ± 0·9 ns and SrCl 39·6 ± 1·6 ns, where the uncertainties representing one standard deviation are given.

Lifetime measurements by optical single and double resonances. Radiative lifetimes of the A 2Π and D 2Σ+ states of CaCl

Abstract Time-resolved optical single and double resonance experiments are presented in which the A 2 Π and D 2 Σ + states of CaCl are investigated using the delayed coincidence method with a single dye laser. The lifetime determined for the A 2 Π 1 2 state is in good agreement with the previously measured value. The lifetime of the D 2 Σ + state was determined to be 17.7±1.2 ns.

Observations of Two Photon Absorption in Gaseous CaCl. A Study of the D 2Σ and X 2Σ States

In the wavelength region, 616-623 nm, two photon processes have been observed in diatomic calcium chloride. The D 2Σ-X 2Σ transitions of both Ca35Cl and Ca37Cl were obtained. Rotational and vibrational constants have been derived for the D 2Σ and X 2Σ states of Ca35Cl.

A time-resolved optical double-resonance study of the E 2Σ state of CaCl

Abstract A time-resolved optical double-resonance experiment is presented in which the CaCl E 2Σ state is studied by the delayed coincidence method using two cw dye lasers.

Fourier Transform Spectroscopy of the B2Σ-X2Σ Transition of BaH

The B2Σ-X2Σ band system of gaseous barium hydride in the wave length region 8900-11200 A has been examined in absorption using a King furnace. The spectrum has been obtained by means of Fourier transform spectroscopy. Seven bands have been rotationally analyzed. Term values and molecular constants of the B2Σ and X2Σ states have been determined by standard least-squares analysis. The following molecular constants have been derived (cm-1): Te ωe ωexe ωeye Be αe 104 × De B2Σ+ 11092.593 1088.898 15.471 0.0237 3.26879 0.07061 1.1585 X2Σ+ 0. 1168.433 14.611 0.0276 3.38226 0.06568 1.1234

Rotational Analysis of the D2Σ-X2Σ Transition of CaCl

The absorption spectrum of gaseous CaCl in the wavelength region 2990-3300 A has been studied using a King furnace. Ten bands belonging to the D2Σ-X2Σ transition have been analyzed and both vibrational and rotational constants have been evaluated. The following molecular constants have been determined (cm-1): X2Σ D2Σ Te 0.0 31 110.934(5) ωe 370.201 423.254(7) ωexe 1.3732 1.581(3) ωeye 9.3 × 10-3 1.6(4) × 10-3 ωeze -4.8 × 10-4 -2.9(2) × 10-4 Be 0.152 233 0.162 975 4(8) αe 7.92 × 10-4 7.968(2) × 10-4 De 1.068 × 10-7 1.0090(3) × 10-7 γe 1.38 × 10-3 1.2 × 10-3 The figures in parentheses stand for one standard deviation in the last digit for the computed quantity.

Rotational analysis of the E 2Σ-X2Σ transition of CaCl

Abstract The absorption spectrum of CalCl in the region 2840–2980 A has been generated using a King furnace. Seven bands belonging to the E 2 Σ-X 2 Σ transition have been rotationally analyzed and molecular constants have been evaluated.