A resonance ionization spectroscopy/resonance ionization mass spectrometry data service

Saloman, E. B.

doi:10.1016/0584-8547(93)80104-3

Cited by 43 publications

(15 citation statements)

References 95 publications

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“…Threshold photoionization cross‐sections for the levels y 3 P ○ (3.93 eV), z 3 H ○ (3.96 eV) and v 3 F ○ (4.2 eV) were taken from Yang et al (2009) and a hydrogenic approximation was assumed for their frequency variation. The cross‐sections were measured by resonance ionization mass spectrometry and for the v 3 F ○ levels they are consistent with Hartree–Fock calculations with relativistic corrections (Saloman 1993). For the other levels, even quantum‐mechanical calculations are not available, thus the photoionization cross‐sections were derived from the hydrogenic approximation (Mihalas 1978).…”

Section: Methodsmentioning

confidence: 54%

Ionization balance of Ti in the photospheres of the Sun and four late-type stars

Bergemann

2011

Monthly Notices of the Royal Astronomical Society

124

125

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In this paper we investigate statistical equilibrium of Ti in the atmospheres of late‐type stars. The Ti i/Ti ii level populations are computed with available experimental atomic data, except for photoionization and collision‐induced transition rates, for which we have to rely on theoretical approximations. For the Sun, the non‐local thermodynamic equilibrium (NLTE) line formation with adjusted H i inelastic collision rates and mafags‐os model atmosphere solve the long‐standing discrepancy between Ti i and Ti ii lines. The NLTE abundances determined from both ionization stages agree within 0.01 dex with each other and with the Ti abundance in C i meteorites. The Ti NLTE model does not perform similarly well for the metal‐poor stars, overestimating NLTE effects in the atmospheres of dwarfs, but underestimating overionization for giants. Investigating different sources of errors, we find that only [Ti/Fe] ratios based on Ti ii and Fe ii lines can be safely used in studies of Galactic chemical evolution. To avoid spurious abundance trends with metallicity and dwarf/giant discrepancies, it is strongly recommended to disregard Ti i lines in abundance analyses, as well as in determination of surface gravities.

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Section: Methodsmentioning

confidence: 54%

Ionization balance of Ti in the photospheres of the Sun and four late-type stars

Bergemann

2011

Monthly Notices of the Royal Astronomical Society

124

125

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“…According to Saloman [1991], the required laser energy to achieve photoionization efficiency from the excited state at the two-photon level near unity at this wavelength is 19 mJ cm À2 . To attempt to saturate the two-photon population, the REMPI laser was focused 1.7 (±0.1) mm above the sample down to beam waist of~32 μm, yielding a power density of~1227 W cm À2 .…”

Section: Introductionmentioning

confidence: 99%

Investigating potential sources of Mercury's exospheric Calcium: Photon-stimulated desorption of Calcium Sulfide

Bennett

McLain

Sarantos

et al. 2016

J. Geophys. Res. Planets

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Ground‐based and MErcury Surface, Space ENvironment, GEochemistry, and Ranging observations detected Ca0 and Ca+ in the exosphere of Mercury as well as unexpectedly high levels of sulfur on Mercury's surface. The mineral oldhamite ((Mg,Ca)S) could be a predominant component of the Mercury surface, particularly within the hollows identified within craters, and could therefore serve as a source of the observed exospheric calcium. Laboratory measurements on the photon‐stimulated desorption (PSD) of CaS powder (an analog for oldhamite) at a wavelength of λ = 355 nm have been conducted, utilizing resonance‐enhanced multiphoton ionization time‐of‐flight mass spectrometry to determine the yields and velocity distributions of Ca0. The desorbing Ca0 could be fit using two Maxwell‐Boltzmann components: a 600 (±30) K thermal component and a 1389 (±121) K nonthermal component, the latter accounting for ~25% of the observed signal. Cross sections for PSD using 3.4 eV photons were found to be 1.1 (±0.7) × 10−20 cm2 for Ca0 and 3.2 (±0.9) × 10−24 cm2 for Ca+. Adopting these cross sections, a Monte Carlo model of the release of Ca0 by PSD from the Tyagaraja crater finds the neutral microexosphere created from this process to be substantial even if only 1% CaS is assumed in the hollows. Diffuse reflectance UV‐visible measurements were made on the CaS powder to determine a bandgap, Eg, of 2.81 (±0.14) eV via the Tauc method.

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“…In order to complete the wealth of spectroscopy data on gallium [19][20][21][22][23][24] the Rydberg series studied previously was measured once again this time using the grating tuned laser at high-resolution and continuous scanning. This was done in laser frequency of the second excition step [cm -1 ] order to verify the existing excitation schemes or to develop superior excitation schemes for on-line laser ion source operation.…”

Section: Spectroscopy Of Rydberg Series In Galliummentioning

confidence: 99%

Grating tuned Ti:Sa laser for in-source spectroscopy of Rydberg and autoionizing states

et al. 2010

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Due to the large absorption cross section for optical transitions into Rydberg and autoionizing states compared to non-resonant ionization, these states are of particular interest for use in efficient laser resonance ionization excitation schemes as used in Resonant Ionization Laser Ion Sources (RILIS). In order to identify these atomic states extensive laser spectroscopy has to be performed. The lasers employed at TRIUMF's laser ion source are birefringent filter tuned titanium:sapphire (Ti:Sa) lasers which are designed for long term frequency stability rather than continuous tuning. The design and characteristics of a grating tuned, high repetition rate, pulsed Ti:Sa laser for spectroscopy applications are presented. This laser allows fast scans of up to 40 THz with a laser linewidth of approximately 6 GHz. First tests were performed by scanning across the Rydberg series of gallium.

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A resonance ionization spectroscopy/resonance ionization mass spectrometry data service

Cited by 43 publications

References 95 publications

Ionization balance of Ti in the photospheres of the Sun and four late-type stars

Ionization balance of Ti in the photospheres of the Sun and four late-type stars

Investigating potential sources of Mercury's exospheric Calcium: Photon-stimulated desorption of Calcium Sulfide

Grating tuned Ti:Sa laser for in-source spectroscopy of Rydberg and autoionizing states

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