High resolution laser spectroscopy of Cs2. II. Dopplerfree polarization spectroscopy of the C 1Π u ←X 1Σ+ g system The fine structure of the b(1)3TIu state of the lithium dimer was observed for the first time and studied using Doppler-free polarization spectroscopy. The triplet state was accessed by excitation of the A I~u"" {t/; = 2,J =33) -be 1 )3TIu Cv = 9,N = 32,F I ,e) spin-orbit perturbed levels. The remaining two fine structure levels were excited by using the Zeeman interaction to mix levels of different J. Two polarization geometries, 17" pump and cr pump, were used to study separately different groups of M J levels in magnetic fields up to 3 kG. An irreducible tensor derivation of the fine structure and Zeeman Hamiltonian matrix in Hund's case (b) symmetrized basis functions was carried out and used to determine the perturbation parameters and the spin-spin and spin-rotation fine structure constants by a fit to the Zeeman splitting pattern. The spin-orbit contribution to the fine structure is too small in the high J states to be found accurately. The electronic spin-orbit coupling perturbation for the interaction between the singlet and triplet states was also determined to be Hel(A_b) = 0.1172 ± 0.0008 cm -I.In the present study the A I~t (v =2,J = 33) .-b(1)3TIu (v = 9,N = 32), fine structure states were excited from X I~g+ (v = O,J = 34 and J = 32) with a single 928
A two-frequency beam from a Zeeman laser scatters elastically from an isotropic medium, such as randomly oriented viruses or other particles suspended in water. The Zeeman effect splits the laser line by 250 kHz, and beats can be seen electronically in the signal from a phototube that views the scattered light. There are independently rotatable half-wave and quarter-wave retardation plates in the incident beam and a similar pair in the observed scattered beam, plus a fixed linear polarizer directly in front of the detector. Each of the four retarders has two angular positions, providing a total of 16 possible polarization cases. For each of the 16 cases, there are three data to be collected: (1) the average total intensity of the scattered light, (2) the amplitude of the beats in the scattered light, and (3) the phase shift between the beats of the scattered light and those of a reference signal from the laser. When a singular value decomposition technique is used, these threefold redundant data are rapidly ransformed into a best-fit 4 × 4 Mueller scattering matrix. We discuss several different measurement strategies and their systematic and statistical errors. We present experimental results for two kinds of particle of wavelength size: polystyrene spheres and tobacco mosaic virus. In both cases the achiral retardation element M(34) of the Mueller matrix is easily measurable.
Pressure dependence of magnetic transition temperature in Li[LixMn2−x]O4 (0≤x≤1/3) studied by muon-spin rotation and relaxation J. Appl. Phys. 113, 053904 (2013); 10.1063/1.4790377 Fourier transform spectroscopy of the 13Σ+ g -a 3Σ+ u transition of the 6Li2 molecule J. Chem. Phys. 91, 6036 (1989); 10.1063/1.457421 The Li2 b3Σ+ g-X3Σ+ u transition and a new UV absorption band AIP Conf. Proc. 160, 386 (1987); 10.1063/1.36774The threephoton spectrum of the 1 B 2u ←1 A 1g transition in benzene: Analysis of vibronic and rotational structure Letters to the Editor J = 33) -b 311u (v = 9, N = 32, Fl' e) pair of perturbed levels from X l~t (v = 0) for a 95% lithium-6 metal vapor
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