Doppler-free Saturated Absorption Spectroscopy Research Articles

Isotope shifts and hyperfine structure in the 369.4-nm 6s-6p1/2 resonance line of singly ionized ytterbium.

Isotope shifts and hyperfine structure in the 369.4-nm 6s-6${\mathit{p}}_{1/2}$ resonance line of the single-valence-electron system ${\mathrm{Yb}}^{+}$ have been determined with an accuracy of about 1 MHz by Doppler-free saturated absorption spectroscopy in a sputtered vapor. Ab initio many-body perturbation theory calculations in the coupled-cluster approach were then used to evaluate the electronic field shift factor, F=-14.9(2) GHz ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}2}$, and to estimate the specific mass shift (SMS) factor, ${\mathit{K}}^{\mathrm{SMS}}$=(1\ifmmode\pm\else\textpm\fi{}1)${\mathit{K}}^{\mathrm{NMS}}$, where NMS is the normal mass shift. The uncertainty in the calculated F factor is based on the level of agreement between the hyperfine structure constants calculated for 6s and 6${\mathit{p}}_{1/2}$ states using the same wave functions as for the F-factor calculation and the experimentally determined hyperfine-structure constants. The calculated F and ${\mathit{K}}^{\mathrm{SMS}}$ factors have been used to extract values for the difference in mean-square charge radius, \ensuremath{\delta}〈${\mathit{r}}^{2}$${\mathrm{〉}}_{1}^{\mathit{A}}$,${\mathit{A}}_{2}$, between isotope pairs ${\mathit{A}}_{1}$,${\mathit{A}}_{2}$, and the related nuclear charge distribution parameter ${\ensuremath{\lambda}}_{1}^{\mathit{A}}$,${\mathit{A}}_{2}$, which are just within the uncertainties of the tabulated values of Aufmuth et al. [At. Data Nucl. Data Tables 37, 455 (1987)] based on semiempirical estimates of F and assumed values of ${\mathit{K}}^{\mathrm{SMS}}$.

Isotope shifts and hyperfine structures investigation of doubly excited levels in SrI

We measured isotope shifts and hyperfine structure of visible transitions of stable strontium isotopes by means of Doppler-free saturated absorption spectroscopy. In particular, we investigated transitions between excited states where the upper level involves two excited electrons. We report hyperfine coupling constants for the levels 5p4d1D2, 5p4d3F2, 5s4d3D1, 5s6s3S1, 5s5p3P1 and, for some of the studied transitions, we separate the specific mass and volume contribution to the isotope shifts.

Doppler - free spectroscopy and isotopic shift of the Mg I resonance line at 285 nm

Doppler-free saturated absorption spectroscopy of the Mg I resonance line at 285 nm (1S0 —1 P1 transition) has been performed with a c.w. single-mode UV source, and has led to a new determination of the isotopic structure of this line.

High-contrast Doppler-free transmission spectroscopy

By applying Doppler-free saturated absorption spectroscopy in the regime of high integrated sample absorption, high-contrast Doppler-free laser transmission signals can be obtained as demonstrated in experiments on the sodium D lines. Natural linewidth background-free signals are observed.

Hyperfine structure measurements in 51V using Doppler-free saturated absorption and polarization spectroscopy

The hyperfine structure in the six fine structure levels in the 3d 44p 6F term in 51V has been studied and the magnetic dipole interaction constants were determined employing Doppler-free saturation spectroscopy on vanadium atoms produced by sputtering in a hollow-cathode discharge. The drastic improvement that can be obtained in saturated absorption spectroscopy by modulating the pump beam at a high modulation frequency is clearly demonstrated in the present paper. For these high modulation frequencies a comparison with polarization spectroscopy showed that the intrinsic advantage in signal-to-noise ration that polarization spectroscopy has at low modulation frequencies is essentially lost at higher modulation frequencies. Also, in this particular case, the effects of velocity changing collisions were rather small. Consequently the two methods were considered being equally powerful in the present measurement situation.

Isotope and hyperfine splittings for two UV transitions in tungsten I by saturation and polarisation spectroscopy

Isotope shifts and hyperfine splittings in tungsten I have been measured by Doppler-free saturated absorption and polarisation spectroscopy on two UV transitions at 294.44 nm and 294.70 nm. The splittings between the even isotopes ( 182W, 184W, 186W) and the splitting between the two strong hyperfine components of 183W were measured in a natural isotopic mixture of tungsten introduced into a hollow cathode discharge. In addition, using single isotope 183W, the level hyperfine splittings were measured by resolving crossover peaks between the strong and weak hyperfine components. These measured level splittings are compared with those predicted from centre of gravity considerations.

Saturation spectroscopy of ultraviolet transitions in mercury with a frequency-doubled cw ring dye laser

Doppler-free saturated absorption spectroscopy has been used to study the ultraviolet HgI transitions 63P0-63D1 at 296.73 nm and 63P0-61D2 at 296.76 nm. The required tunable ultraviolet radiation was produced by a ring cavity cw dye laser with intracavity ADA frequency doubler. The isotope shifts of the 63P0 -63D1 line for naturally abundant mercury have been measured to within a few MHz.