Optical selectivity calculation of calcium isotopes in a double-resonance ionization scheme

Abstract

Optical selectivities of calcium isotopes have been calculated for the 4s 2 1 S 0 422.7 nmdouble-resonance ionization scheme using the spectral simulation (SS) approach. Optical selectivities obtained by the SS approach are in good agreement with the results obtained by the density matrix formalism. Studies on the effect of laser detuning and linewidth on optical selectivities indicate that lasers with 50 MHz linewidth for both the excitation steps can yield an optical selectivity of 2.2 × 10 5 , which is adequate for selective excitation of the 41 Ca isotope for certain applications.

Numerical Study of the Dynamics of Laser Lineshape and Linewidth

“…Laser lineshape and linewidth play a key role in theoretical studies related to the fields of resonance ionization spectroscopy (RIS) [1,2], laser isotope separation [3], as well as resonance ionization mass spectrometry (RIMS) [4]. The first treatment of laser linewidth was conducted by Schawlow and Townes in the late 1950s.…”

Ionization yield and isotopic selectivity of three-step photoionization of atoms by pulsed lasers

“…It deals with multi-step photoionization of atoms of the selected isotope. Studies on the isotope-selective photoionization of atoms of lanthanides and actinides with several isotopes have been variously reported (Arisawa et al 1983, Karlov et al 1983, Greenland 1988, 1990, Greenland et al 1991, Zhidkov and Krynetskii 1994, Nakajima and Lambropoulos 1994, Choe et al 1995, Young and Shaw 1995, Borisov et al 1996, Suryanarayan and Sankari 1997, Sankari and Suryanarayan 1998, Bushaw et al 1999, Sankari et al 2000. The kinetics of multi-step photoionization of atoms under the influence of laser light pulses is described by either the rate equation approach (Arisawa et al 1983, Karlov et al 1983 or the density matrix approach (Greenland 1988, 1990, Greenland et al 1991, Zhidkov and Krynetskii 1994, Nakajima and Lambropoulos 1994, Choe et al 1995, Borisov et al 1996, Bushaw et al 1999.…”

Isotopic selectivity calculations for multi-step photoionization of calcium atoms using narrow-band lasers

“…The measurement of radioisotope 41 Ca is useful in cosmic ray flux determination, radiochemical age dating, medical tracer isotopes and cosmochemical studies of nucleosynthetic models. Isotopic selectivity of radioisotope 41 Ca in the range of 10 10 -10 16 against the predominant stable isotope 40 Ca is required for useful measurements in these applications.…”

“…It is worthwhile to estimate isotopic selectivity before making a choice of the most efficient photoionization scheme and suitable laser parameters for the experimental measurements. Isotopic selectivity for photoionization schemes using narrow-band lasers is generally calculated using either density matrix (DM) formalism [5][6][7][8][9][10][11][12] or the spectral simulation (SS) approach [13][14][15][16]. The DM approach gives the most accurate description of the multi-step photoionization process, incorporating the coherence effects due to single-frequency laser excitations.…”