Measurementof the 4s(2) S-1(0) -> 4s3d D-1(2) transition probability in calcium (original) (raw)
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The European Physical Journal D - Atomic, Molecular and Optical Physics, 2003
We have measured the ratio between the transition probabilities of two forbidden lines in Ca: the intercombination line at 657.3 nm and the E2 line at 457.5 nm. The value we obtained for this ratio is (54.1 ± 2.4). Combined with the most accurate value available in literature for the lifetime of the 3 P1 level, our measurement gives a value of (54.4 ± 4.0) s −1 for the 1 S0 → 1 D2 transition probability, significantly more accurate than the previous determinations.
Laser gain is reported on the 4p3d 3F -4s3d 3D transitions of Ca at 643.907, 646.257, 647.166, and 649.378 nm following optical pumping of the 4s2 'So -4s4p 3PI intercombination transition at 657.278 nm. The effect is realized through large scale collisional redistribution of energy which rapidly leads to the excitation of higher states and eventual ionization of Ca atoms. Our calculations based on a simple rate equation model suggest that population inversions are a combined result of direct excitation of the upper lasing states through inelastic collisions, and three-body recombination.
Experimental study of the Ca2 {1}S+ {1}S asymptote
European Physical Journal D, 2003
The van der Waals coefficients C6, C8 and C{10} at the ^1S+^1S calcium dimer asymptote are determined from spectroscopic observations. The filtered laser excitation technique was applied for measuring transition frequencies of the Ca2 B-X system from asymptotic levels of the X^1Σ_g+ ground state reaching v''=38. That level which is only 0.2 cm^{-1} below the molecular ^1S+^1S asymptote has an outer classical turning point of about 20 Å. The extraction of confidence limits for the long range coefficients including the dissociation energy from the experimental data involving Monte Carlo simulation is described. A range for the s-wave scattering length is derived.
Experimental and theoretical study of the 3d^{2}D–level lifetimes of ^{40}Ca^{+}
Physical Review A, 2005
We report measurements of the lifetimes of the 3d D 5/2 and 3d 2 D 3/2 metastable states of a single laser-cooled 40 Ca + ion in a linear Paul trap. We introduce a new measurement technique based on high-efficiency quantum state detection after coherent excitation to the D 5/2 state or incoherent shelving in the D 3/2 state, and subsequent free, unperturbed spontaneous decay. The result for the natural lifetime of the D 5/2 state of 1168(9) ms agrees excellently with the most precise published value. The lifetime of the D 3/2 state is measured with a single ion for the first time and yields 1176(11) ms which improves the statistical uncertainty of previous results by a factor of four. We compare these experimental lifetimes to high-precision ab initio all order calculations and find a very good agreement. These calculations represent an excellent test of high-precision atomic theory and will serve as a benchmark for the study of parity nonconservation in Ba + which has similar atomic structure.
Isotope shifts of the4s2S01→4s5pP11transition and hyperfine splitting of the4s5pP11state in calcium
Physical Review A, 2004
Using a technique based on production of ion Coulomb crystals, the isotope shifts of the 4s 2 1 S0 → 4s5p 1 P1 transition for all naturally occurring isotopes of calcium as well as the hyperfine splitting of the 4s5p 1 P1 state in 43 Ca have been measured. The field shift and specific mass shift coefficients as well as the hyperfine structure constants for 43 Ca have been derived from the data.
Study of coupled states for the (4s 2 ) 1 S + (4s4p) 3 P asymptote of Ca2
European Physical Journal D, 2005
The coupled states A1Σu+ (1D + 1S), c3Πu (3P + 1S) and a3Σu+ (3P + 1S) of the calcium dimer are investigated in a laser induced fluorescence experiment combined with high-resolution Fourier-transform spectroscopy. A coupled state analysis of the observed levels, considering a potential model, which is complete within the subspace of relevant neighboring states, is performed using the Fourier Grid Hamiltonian method. We determine the potential energy curve of the A1Σu+ and c3Πu states and the strengths of the couplings between them. The c3Πu and a3Σu+ states are of particular importance for the description of collisional processes between calcium atoms in the ground state 1S0 and excited state 3P1 applied in studies for establishing an optical frequency standard with Ca.
Precision measurement of the branching fractions of the 4p 2P3/2 decay of Ca II
The European Physical Journal D, 2008
We perform precision measurements of the branching ratios of the 4p 2 P 3/2 level decay of a single 40 Ca + ion suspended in a linear Paul trap. High precision is achieved by a novel technique based on monitoring the population transfer when repeatedly pumping the ion between different internal states. The branching fractions into the 4s 2 S 1/2 , 3d 2 D 5/2 and 3d 2 D 3/2 levels are found to be 0.9347(3), 0.0587(2) and 0.00661(4), respectively. For the branching ratio A(P 3/2 −S 1/2 )/ J A(P 3/2 −DJ ) = 14.31(5), we find a forty-fold improvement in accuracy as compared to the best previous measurement.
Observation of the ... system of calcium dimer
We report the observation of collision-induced spectra of calcium dimer in the 680-692 nm region, The spectra were recorded after resonant laser excitation of 4 s4 P 3 PI state of atomic calcium. Here the upper state a 3 L:~ is populated through collisions, The same spectra were reproduced in a low-current glow discharge in calcium vapor. The assignment of the observed spectral lines was carried out by applying the Dunham-type analysis and the spectra were assigned to the a 3L:~-X I L:; transition of Caz, The existence of a 3L:~ state with voo = 13850 ± 1 cm-I and We ~ 37,6 cm-I is confirmed,