Hyperfine-Induced 1s2s1S0-1s2p3

Abstract

We have observed the 1s2s 1 S 0-1s2p 3 P 0 transition in 14 N 51 using Doppler-tuned fast-beam laser spectroscopy. This transition, absolutely forbidden for atoms with zero nuclear spin, occurs due to mixing of states of different J by the hyperfine interaction. By measuring the difference between the 2 1 S 0-2 3 P 1,F and 2 1 S 0-2 3 P 0 transition energies, we have obtained a value for the 1s2p 3 P 1-3 P 0 fine-structure splitting in N 51. Our result will test quantum-electrodynamic corrections to recent high precision calculations [Z.-C. Yan and G. W. F. Drake, Phys. Rev. Lett. 74, 4791 (1995)]. [S0031-9007(96)00403-6]

Precision Measurement of the1s2pP32Myers1, Margolis2, Thompson3 et al. 1999Phys. Rev. Lett.Self Cite442110View full textAdd to dashboardCite

“…Our result, with a precision of 61 ppm for the centroid, improves on a previous measurement in F 71 [10] by a factor of 19 and is the most precise fine structure measurement on a heliumlike ion to date. It complements a previous measurement of the J 0 1 interval in 14,15 N 51 [14,15] and tests O͑a 5 ͒ theoretical contributions at the level of 65%.…”

“…This is because there are two 2 3 P fine structure intervals and because the same methods used for helium can be used to calculate fine structure in moderate Z heliumlike ions where the relative magnitudes of these higher-order terms are larger. Hence fine structure measurements in moderate Z heliumlike ions [10][11][12][13][14][15], even though less precise than measurements in helium, can provide sensitive tests of the theory. Here we report a measurement of the three hyperfine components of the 19 F 71 1s2p 3 P 2 -3 P 1 fine structure interval, obtained by directly inducing the M1 transitions using a CO 2 laser, in a fast, foil stripped fluorine ion beam.…”

Determination of Hyperfine-Induced Transition Rates from Observations of a Planetary Nebula

“…More recently, observations of hyperfine-induced transitions have been dealing with fluorescence in He-like ions, invoked by laser excitations ( [10,11]), highly ionized species ( [12 -14]), and rare-earth elements ( [15]). In the He I-like ions there are two different possibilities of HPFinduced transitions: a n 0 transition 1s2s 1 S e 0 !…”

X-ray laser spectroscopy of highly charged ions at FLASH

“…In this respect, our technique clearly points toward new frontier, in view of the 6 ppm statistical uncertainty of the 2 2 S 1/2 -2 2 P 1/2 transition in Fe 23+ Figure 13. Transition energies accessible by laser spectroscopy in multiply or highly charged ions (magenta data points chronologically [40,37,41,42,67,68,19,69,21,70,22,20]) and some selected examples in neutral atoms (black data points chronologically [71,72,16,73,15]). With the upcoming new generation of light sources like FLASH in Hamburg, LCLS (Linac Coherent Light Source) in Menlo Park, USA, and XFEL (X-Ray Free-Electron-Laser) the field of laser spectroscopy will open to completely new wavelength ranges.…”