Collinear fast-beam laser spectroscopy experiment: Measurement of hyperfine structure and isotope shifts in Xe II

Bingham, C. R.; Gaillard, M.L.; Pegg, D. J.; Carter, H.K.; Mlekodaj, R.L.; Cole, J.D.; Griffin, P. M.

doi:10.1016/0167-5087(82)90388-x

Cited by 17 publications

(7 citation statements)

References 8 publications

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“…1b (again, the other six are of the same transition shown for the even isotopes). The hyperfine splitting constants are only known for a limited set of energy levels [16][17][18][19][20]. While isotope shifts and all of the hyperfine splitting constants are available for the upper and lower levels of the neutral 823.2 nm transition, the 834.7 nm xenon ion transition only has data on the nuclear spin splitting constants of the upper state, and no information is available on the transitiondependent isotope shifts.…”

Section: Xenon Spectroscopymentioning

confidence: 99%

Laser-induced fluorescence measurements of velocity within a Hall discharge

2001

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) 18-01-2007 REPORT TYPE Journal Article DATES COVERED (From -To) TITLE AND SUBTITLE 5a. CONTRACT NUMBER Laser-induced Fluorescence Measurements of Velocity within a Hall Discharge ABSTRACTThe results of a study of laser-induced fluorescence velocimetry of neutral and singly ionized xenon in the plume and interior portions of the acceleration channel of a Hall thruster plasma discharge operating at powers ranging from 250 to 725 W are described. Axial ion and neutral velocity profiles for four discharge voltage conditions (100V, 160V, 200V, 250V) are measured as are radial ion velocity profiles in the near-field plume. Ion velocity measurements of axial velocity both inside and outside the thruster as well as radial velocity measurements outside the thruster are performed using laser-induced fluorescence with nonresonant signaldetection on the xenon ion 5d[4]7/2-6p[3]5/2 excitation transition while monitoring the signal from the 6s[2]3/2-6p[3]5/2 transition. Neutral axial velocity measurements are similarly performed in the interior of the Hall thruster using the 6s[3/2]02-6p[3/2]2 transition with resonance fluorescence collection. Optical access to the interior of the Hall thruster is provided by a 1-mm-wide axial slot in the insulator outer wall. While the majority of the ion velocity measurements used partially saturated fluorescence to improve the signal-to-noise ratio, one radial trace of the ion transition was taken in the linear fluorescence region and yields a xenon ion translational temperature between 400 and 800 K at a location 13 mm into the plume.

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Section: Xenon Spectroscopymentioning

confidence: 99%

Laser-induced fluorescence measurements of velocity within a Hall discharge

2001

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“…Unfortunately experimental data for the isotope shift of the 5d 2 F 7/2  6p 2 D 0 5/2 transition is not available. Following the approach of Manzella 6) and others experimental data of the similar 5d 4 D 7/2  6p 4 P 0 5/2 was used 7,8) . Further splitting into a hyperfine structure occurs for the isotopes with non-zero nuclear spin, Xe 129 and Xe 131 , due to nucleon-electron spin interaction producing a total of 19 lines.…”

Section: Hyperfine Structurementioning

confidence: 99%

Diagnostics of Xe Ion in an Anode-layer Type Hall Thruster Using Laser-Induced Fluorescence

Yokota

Lempke

Matsui

et al. 2009

Trans. JSASS Space Tech. Japan

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The discharge oscillation in an anode-layer type Hall thruster is one of the most serious problems to be overcome. In general, a hollow anode is used in order to stabilize the operation. Recent numerical simulation results show the stable operation depends on the ionization rate in the hollow anode. In order to verify the simulation result, it is needed to measure the plasma profile in the hollow anode.In this paper, as a first step, the number density and the velocity distribution of single-charged xenon ions in an anode-layer type Hall thruster were investigated by means of Laser-Induced Fluorescence (LIF) for the 5d 2 F 7/2 →6p 2 D 0 5/2 excitation transition at 834.7 nm detecting the non-resonant line to the 6s 2 P 3/2 state at 541.9 nm. As a result, we obtained the relative ion number density and the velocity distributions. The ion velocity distribution function shows both ionization and acceleration occur in the acceleration channel, while only ionization occurs in the hollow anode.

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“…Each of these isotopes causes a slightly different transition energy E ij , resulting in isotopic splitting. Both of the computational models in this study use naturally-occurring xenon isotopic abundances, 15 while we take isotopic shifts (conventionally defined relative to the center frequency for 132 Xe) for the 5d 4 D 7/2 − 6p 4 P 0 5/2 transition at 605.1 nm from the fast ion-beam LIF surveys of Bingham et al 16 and Borghs et al 17 Seven of the nine stable isotopes of xenon have even atomic mass, resulting in no nuclear spin I. The two isotopes with an odd atomic mass, however, have non-zero nuclear spin quantum numbers I.…”

Section: /2mentioning

confidence: 99%

“…transition taken from the fast ion-beam LIF surveys of Bingham et al 16 and Borghs et al 17 Figure 2(a) shows the 605.1 nm absorption spectrum for a perfectly cold stationary plasma, where the velocity distribution f (v) = δ(v). This can be described by the convolution…”

Section: /2mentioning

confidence: 99%

Diode Laser-Induced Fluorescence of Xenon Ion Velocity Distributions

Smith¹,

Ngom²,

Linnell³

et al. 2005

41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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We present preliminary results from optogalvanic and laser-induced fluorescence (LIF) measurements of the nuclear-spin and isotopic structure of the 5d 2 F 7/2 → 6p 2 D 0 5/2 transition of singly-ionized xenon (Xe II) at 834.7 nm. Ion velocity distributions deconvolved from 5d 4 D 7/2 → 6p 4 P 0 5/2 optogalvanic spectra at 605.1 nm provided the Doppler broadening function for a computational model of the 834.7 nm absorption line. Ensemble averaging of optogalvanic spectra taken at 834.7 nm provided an experimental data set for estimation of the unknown isotopic shifts and lower-state (5d 2 F 7/2) nuclear-spin constants via a conjugate-gradient optimization routine. Deconvolution of 834.7 nm LIF spectra with the newly-modeled 834.7 nm cold-plasma spectrum returned an unusually broad velocity distribution, rather than the expected kinematic cooling effect. Comparison of a deconvolved ion energy distribution taken in a 500 V ion beam with retarding potential analyzer data showed bulk ion energy agreement within 1%, but only qualified similarity between the distributions. Grid misalignment during the LIF experiment may be responsible for the usually broad Doppler broadening. As a result, we are presently unable to reliably validate our deconvolution method at 834.7 nm.

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Collinear fast-beam laser spectroscopy experiment: Measurement of hyperfine structure and isotope shifts in Xe II

Cited by 17 publications

References 8 publications

Laser-induced fluorescence measurements of velocity within a Hall discharge

Laser-induced fluorescence measurements of velocity within a Hall discharge

Diagnostics of Xe Ion in an Anode-layer Type Hall Thruster Using Laser-Induced Fluorescence

Diode Laser-Induced Fluorescence of Xenon Ion Velocity Distributions

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