- Balzers QMG 112 and 511, purchased and constructed
over several years beginning in 1980, is a dual quadrapole mass
spectrometer for complete chemical analysis (at an accuracy of
3-5 percent) of extremely small samples of gas, typically from
an aqueous fluid inclusion as small as several microns in diameter.
The quadrapole system can routinely analyze the chemical composition
of gas mixtures containing picomole quantities of N2,
O2, Ar, H2, He, Ne, CH4, HF,
HC1, H2S, SO2, HCN, CO, CO2,
SO2, Kr, Xe, and HnCn and chemical
reaction products dissolved in minerals and in fluid inclusions.
Provisions for bulk gas analysis from crushing or thermal decrepitation
via a calibrated leak valve, real-time monitoring of released
gases from thermal ramp heating of samples, and for GC-MS and
direct flow injection of crushed or thermally decrepitated samples.
The instrument includes a Nd-Yag laser and Nikon microscope system
for releasing volatiles in fluid inclusions or minerals. Gases
from this system can also be transferred to a GC-IRMS via capillaries
to the open-split interface on the MAT 252 for isotopic analysis
of released gas (CO2). Located in Denver.
- Balzers QMG 421, purchased in 1993, is a quadrapole
mass spectrometer. It is coupled to a microscope-mounted sample
chamber within a walk-in freezer. It includes a CO2
laser and delivery system for ablating the ice and liberating
gases contained in a single gas bubble. It also includes the
necessary valving for separating gases by chromatography and
splitting gas for admission to the GC-IRMS open-split capillary
interface on the MAT 252. High precision analysis of CO2
in an individual 0.5mm diameter gas bubble in polar ice can be
determined to ±/-0.7ppm by volume with quantitative detection
below 10-15 moles in the "air" mixture. Located in