- Measurement of the vibrational state dependence of the LiH A 1Σ+ dipole moment
-
Zero field molecular level crossing spectroscopy in the J' = 2 rotational state has been employed to measure the electric dipole moment μν of several vibrational levels v' of the LiH A 1Σ+ excited electronic state.The dipole moments are determined to be μ1 = 1.88+/-0.19 D, μ2 = 1.49+/-0.18 D, and μ5 = 0.29+/-0.05 D, where the quoted uncertainties represent 95percent confidence intervals.These experimental values are found to agree rather well with vibrationally averaged dipole moments from the ab initio calculation by Docken and Hinze .The extreme dependence of μν on vibrational level is striking and, on the basis of the ab initio results, can be ascribed to a change in the electronic structure of the LiH A state with internuclear separation.
- Dagdigian, Paul J.
-
-
Read Online
- Preparations and de/re-hydrogenation properties of LixNa3-xAlH6 (x=0.9–1.3) non-stoichiometric compounds
-
Mixed alkali alanates LixNa3-xAlH6 have been successfully synthesized by means of grinding mixtures of Li3AlH6 and Na3AlH6 in specific molar ratios. Non-stoichiometric Lix/
- Fan, Xiaolu,Zhang, Yao,Zhu, Yunfeng,Phillips, Cassandra,Guo, Xinli,Chen, Jian,Wang, Zengmei,Li, Liquan
-
p. 648 - 654
(2017/09/28)
-
- Stability and structure of LinH molecules (n=3-6): Experimental and density functional study
-
The density functional calculations of LinH molecules were used to provide the stability and structure for these molecules. The temperature dependent contributions to the free energy was calculated for the temperatures of the measurements and the resulting free energy functions were used to analyze the mass-spectroscopic data. The equilibrium constants for a number of reactions was measured and mass-spectroscopic measurements were performed over solutions of hydrogen in liquid lithium. The results provide valuable and complementary information about reaction enthalpies, atomization energies and stabilities of the molecules.
- Wu,Jones
-
p. 5128 - 5132
(2007/10/03)
-
- Infrared diode laser spectroscopy of lithium hydride
-
The fundamental and hot bands of the vibration-rotation transitions of 6LiH 7LiH 6LiD and 7LiD were observed by infrared diode laser spectroscopy at Doppler-limited resolution.Lithium hydride molecules were produced by the reaction of the Li vapor with hydrogen at elevated temperatures.Some 40 transitions were observed and, after combined with submillimeter-wave spectra reported by G.M.Plummer et al. , were analyzed to yield Dunham-type constants with accuracies more than an order of magnitude higher than those published in the literature.It was clearly demonstrated that the Born-Oppenheimer approximation did not hold, and some parameters representing the breakdown were evaluated.The Born-Oppenheimer internuclear distance rBOe was derived to be 1.594 914 26 (59) Angstroem, where a new value of Planck's constant recommended by CODATA was employed.The relative intensity of absorption lines was measured to determine the ratio of the permanent dipole moment to its first derivative with respect to the internuclear distance: μe/ere=1.743(86).The pressure broadening parameter Δνp/P was determined to P be 6.40 (22) MHz/Torr by measuring the linewidth dependence on the pressure of hydrogen, which was about four times larger than the value for the dipole-quadrupole interaction estimated by Kiefer and Bushkovitch's theory.
- Yamada, Chikashi,Hirota, Eizi
-
p. 6702 - 6706
(2007/10/02)
-
