TY - CONF
T1 - RIMSKI-A Resonance Ionisation Mass-Spectrometer for Determination of Krypton Isotope ratios of extraterrestrial samples
AU - Strashnov, Ilya
AU - Blagburn, Dave J.
AU - Gilmour, Jamie D.
PY - 2011/1/1
Y1 - 2011/1/1
N2 - RIMSKI – Resonance Ionization Mass Spectrometer for Krypton Isotopes – is a newly developed ultra sensitive instrument with a cryogenic sample concentrator and a laser ion source designed for isotopic analysis of extraterrestrial material. Laser heating is used for extraction of krypton from samples into the mass spectrometer volume. Atoms continuously condense on a cold spot in the ion source, and are repeatedly released by laser heating. They are ionized in the evaporation plume using three tunable dye lasers and one frequency tripled Q-switched Nd:YAG laser. Two resonant transitions are employed (at 116.5 nm, produced by four-wave frequency mixing in Xe, and 558.1 nm) and are followed by single photon ionization at 1064 nm. Multiple analyses of air aliquots and <5 mg samples of meteorites, both containing ∼106 total krypton atoms, show precision ∼1% for major isotope ratios. They are reproducible to this level through a day's analyses, allowing calibration for linear and non-linear mass discrimination by sample-standard bracketing. Cosmogenic 81Kr can be reliably detected at the few thousand atom level, corresponding to determination of cosmic ray exposure (CRE) ages from meteorite samples of a few milligrams. Measured CRE ages of noncumulate eucrites are: Pasamonte, 7.9 ± 1.3 My; Sioux County, 20.9 ± 4.0 My; Bereba, 23.7 ± 2.6 My; Stannern, 33.3 ± 2.5 My. These are in good agreement with literature values.
AB - RIMSKI – Resonance Ionization Mass Spectrometer for Krypton Isotopes – is a newly developed ultra sensitive instrument with a cryogenic sample concentrator and a laser ion source designed for isotopic analysis of extraterrestrial material. Laser heating is used for extraction of krypton from samples into the mass spectrometer volume. Atoms continuously condense on a cold spot in the ion source, and are repeatedly released by laser heating. They are ionized in the evaporation plume using three tunable dye lasers and one frequency tripled Q-switched Nd:YAG laser. Two resonant transitions are employed (at 116.5 nm, produced by four-wave frequency mixing in Xe, and 558.1 nm) and are followed by single photon ionization at 1064 nm. Multiple analyses of air aliquots and <5 mg samples of meteorites, both containing ∼106 total krypton atoms, show precision ∼1% for major isotope ratios. They are reproducible to this level through a day's analyses, allowing calibration for linear and non-linear mass discrimination by sample-standard bracketing. Cosmogenic 81Kr can be reliably detected at the few thousand atom level, corresponding to determination of cosmic ray exposure (CRE) ages from meteorite samples of a few milligrams. Measured CRE ages of noncumulate eucrites are: Pasamonte, 7.9 ± 1.3 My; Sioux County, 20.9 ± 4.0 My; Bereba, 23.7 ± 2.6 My; Stannern, 33.3 ± 2.5 My. These are in good agreement with literature values.
UR - https://www.lpi.usra.edu/meetings/metsoc2011/pdf/5273.pdf
M3 - Paper
ER -