High-resolution visible laser spectroscopy of the B̃ 2B1–X̃ 2A1 transition of CaNH2
摘要:
The 000B̃ 2B1–X̃ 2A1 band of CaNH2 has been recorded at high resolution with a laser ablation molecular beam spectrometer. This B̃ 2B1 state is the last of the low-lying electronic states of CaNH2 to be characterized. The pure precession model, which has previously been used to describe the spin-rotation interactions in this family of molecules was used to interpret and correctly assign the spectrum. The detailed analysis of the high resolution spectrum and energy level structure of the B̃ 2B1 state is presented.
Chemiluminescent reactions of alkaline-earth metals with water and hydrazine
作者:Richard F. Wormsbecher、Mitchell Trkula、Cecilia Martner、Robert E. Penn、David O. Harris
DOI:10.1016/0022-2852(83)90335-1
日期:1983.1
low-pressure chemiluminescentreactions of the metal atom vapors with a hydrazine oxidant. The monoamide chemiluminescence spectra are assigned by comparison with those of the isoelectronic alkaline-earth monohydroxides and monofluorides, formed with water and sulfur hexafluoride oxidants. These comparisons also allow the amide's position in the spectrochemical series for monovalent alkaline-earth compounds
Laser spectroscopy of strontium and calcium monoalkylamides
作者:A. M. R. P. Bopegedera、C. R. Brazier、P. F. Bernath
DOI:10.1021/j100295a026
日期:1987.5
A study of the <i>A</i>̃ <sup>2</sup><i>B</i><sub>2</sub>–<i>X</i>̃ <sup>2</sup><i>A</i><sub>1</sub> band system of CaNH<sub>2</sub> employing molecular beam optical Stark spectroscopy
作者:A. J. Marr、M. Tanimoto、D. Goodridge、T. C. Steimle
DOI:10.1063/1.470635
日期:1995.9.15
The 000 à 2B2–X̃ 2A1 visible band system of a supersonic molecular beam sample of calcium amide, CaNH2, recorded in the presence of a variable static electric field has been studied using high resolution laser induced fluorescence spectroscopy. The determined spectroscopic parameters are (in cm−1), origin=15 464.366 9(8); A″=13.057 4(9); B″=0.300 47(5); C″=0.292 88(5); εbb″=0.001 1(3); εcc″=0.001 1(3); A′=11.448 7(2); B′=0.307 1(1); C′=0.299 2(1); εaa′=8.238(2); εbb′=0.005 2(6); εcc′=0.055 7(6); Δsk=−0.060 8(5). The rotational parameters are interpreted to give an approximate r0 structure. The large spin-rotation parameter for the à 2B2 state is discussed in terms of a second order spin–orbit interaction with other low-lying electronic states. Stark splitting of the PP11(1.5)+PQ12(0.5) branch feature was analyzed to produce a ground state permanent electric dipole moment, μ″, of 1.74(1) D. A comparison of μ″ with other monovalent calcium compounds is given.
A high-resolution analysis of the C̃ 2A1–X̃ 2A1 transition of CaNH2: Pure precession in polyatomic molecules
作者:Zulfikar Morbi、Chunfeng Zhao、Peter F. Bernath
DOI:10.1063/1.473535
日期:1997.3.22
The high resolution spectrum of the 000 vibronic band of the C̃ A12–X̃ A12 transition of CaNH2 was recorded with a laser ablation/supersonic molecular beam spectrometer. Approximately 140 lines of the Ka′=0←Ka″=0 and the Ka′=1←Ka″=1 sub–bands were measured and combined with the previous à B22–X̃ A12 and B̃ B12–X̃ A12 results. A global fit of the data was carried out and the effective spectroscopic constants for the X̃, Ã, B̃, C̃ states are reported. A complete set of spin–rotation constants (εαα’s) are now available for the à B22, B̃ B12 and C̃ 2A1 states. The unpaired electron in these three excited states can be considered to be located in three p–orbitals (px,py,pz) centered on the metal atom. The simple pure precession model provides estimates for the 9 spin–rotation parameters in the Ã, B̃, and C̃ states.