Spectroscopy fast beam laser

COLL INEAR FAST-BEAM LASER SPECTROSCOPY... 

As mentioned above, the radon and radium sequences have been investigated by collinear fast-beam laser spectroscopy, whereas in francium all three atomic-beam methods, ABMR, atomic-beam laser spectroscopy and collinear laser spectroscopy, have contributed. 

Abstract. Using Doppler-tuned fast-beam laser spectroscopy the ls2p 3Po - 3Pi fine structure interval in 24Mg10+ has been measured to be 833.133(15) cm-1. The calibration procedure used the intercombination ls2s 1So - ls2p 3Pi transition in 14N5+. The result tests quantum-electrodynamic and relativistic corrections to high precision calculations, which will be used to obtain a new value for the fine structure constant from the fine structure of helium. 

Abstract. Using Doppler-tuned fast-beam laser spectroscopy the ls2p Po - Pi fine structure interval in has been measured to be 833.133(15) cm . The cah-... 

The combination of collinear fast-beam laser spectroscopy and P-RADOP (radiation-detected optical pumping) has been used to measure nuclear spins and moments of neutron-rich isotopes of the light alkali elements jLi [72-74] and Na [75]. Here, the optically pumped fast atomic beam is implanted into a single crystal placed in a static magnetic field. The NMR signal is destroying the nuclear polarization detected by measuring the p-decay asymmetry. 

The nuclear spins and moments of the strongly deformed rare-earth nuclides have been discussed in detail previously within die Nilsson model in connection with the ABMR experiments mentioned above [79]. The addition of the data fiom coUinear fast-beam laser spectroscopy [48, 50, 71], the new reference values on spectroscopic quadrupole moments from muonic and pionic hfs [1], and the refined calculations within the partice-rotor model, including a number of orbitals close to the Fermi surface, have however resulted in a more complete picture and a better understanding of tiie nuclear single-particle stmcture in this region. 

Among the odd-proton rare-earths, the element europium (Z = 63) has been thoroughly investigated at ISOLDE by coUinear fast-beam laser spectroscopy in the range Eu [47]. The ABMR works include spin measurements in ... 

With laser beams, the effect can be observed in absorption. This is the basis for collinear fast-beam laser spectroscopy. Among the Doppler-free techniques (described in Part A, Chapter 15 by W. Demtroder) it is the only one using linear absorption without velocity selection as in collimated atomic beams. 

Table 1. Measurements on Radioactive Nuclides by Collinear Fast-Beam Laser Spectroscopy... 

Figure 10. Essential components of the ISOLDE setup for collinear fast-beam laser spectroscopy. The postacceleration and scanning...

R. Neugart Collineai fast-beam laser spectroscopy In Progress in Atomic Spectroscopy, Pt. D, ed. by H.K. Beyer, H. Kleinpoppen (Plenum, New York 1987) p. 75... 

Doppler) tuning capability, making it possible resonantly to interact on two optical transitions using only one laser field, retroreflected along the fast accelerated particle beam. It will be shown, that high optical resolution, Doppler free to first order, precise velocity control and high time resolution can be obtained in three-level fast beam laser spectroscopy. 

The apparatus used in Fast Beam Laser Spectroscopy is shown in Fig.l. 

The next important feature in fast beam laser spectroscopy concerns the velocity distribution. Due to kinematic velocity compression, the initial thermal distribution of velocities in the ion source is reduced by a factor R = 4cT/eV, where T is the ion source temperature and V the acceleration voltage. Including the voltage spread 6V, the Doppler width in our accelerator is 20-200 MHz, depending on mass and acceleration voltage. The transverse velocity distribution (particle wave front curvature) not affected during acceleration, contributes to the linewidth. 

Mueller, E.W. Otten, C, Ekstrom, J. Heinemeier, ISOLDE, Fast-Beam Laser Spectroscopy of Neutron-Rich Barium Isotopes, Hyperfine Inter. 9 151 (1981) R.E. Silverans, G. Borghs, J.-M. 

Collinear Fast Beam-Laser Spectroscopy on 5d c/o Barium... 

Fast-Beam Laser Spectroscopy on Radioactive Isotopes in the Rare-Earth Region, Oak Ridge, 1982, CERN-EP/82-80, 18 June 1982 F. Buchinger, A.C. Mueller, B. Schinzler, K. Wendt, C. Ekstrom, W. Klempt, R. Neugart, Fast-beam laser spectroscopy on metastable atoms applied to neutron-deficient ytterbium isotopes, Nucl. Instr. Meth. (1982, to be published). 

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