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- W2185596761 abstract "Dcvclopmenr of reliable and precise methods for measuring the ratios of the isotopes of oxygen, 'bO/'O and O/O. in silicate iiunerals wilfi spatial resolution on the order of tens of microns is of coiisidcrahle interest to the geochemical community. Laser heating or ablation in a F2 amospherc releases 0. lnm small volumes of nuiieral material and so affords considerable reduction in sample size relacive to ainvenuonal inethcxls A distinct advantage of laser treatment over other methods of microanalysis is lhal he lihcrated oxygen can be analysed using highly precise multicollector, magnetic sector mass spccLroinetcFs. Infrared (IR) and visible lasers iixlucc fluorination by melting mineral material. Difficulties arise, Iiowcvcr, hccausc oxygen preferentially enriched iii I7O and is leh behind in the partially melted annular mil~s rhdt surround IR and msible laser produced pits. resulting in inaccurate measurements with p>or rcproducihility. Ullraviolel (UV) laser ablation cliniinates this problem. Silicate hand gaps are COmpWdblc io UV photon energy and so ahlauoli by IJV involves a significant cleclmnic component. Fluixinauon occurs wiUun the hot plasma plume above !he ablation site with minimal heating of the mineral itscll. High UV pulsc repetition rdtes are desirahlc to minimise oxygen background in the vacuum exfxaction system by iiiiniiiiising ablation times." @default.
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- W2185596761 date "1995-01-01" @default.
- W2185596761 modified "2023-09-27" @default.
- W2185596761 title "CWF71 Oxygen Isotope Ratio Analysis of Silicate and Oxide Minerals by UV Ablation with a Frequency-Doubled Copper Vapour Laser" @default.
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