By Charles Meyer; Allan H Treiman; Theodor Kostiuk; Lunar and Planetary Institute.; United States. National Aeronautics and Space Administration
Read or Download Planetary Surface Instruments Workshop : held at Houston, Texas, May 12-13, 1995 PDF
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Additional resources for Planetary Surface Instruments Workshop : held at Houston, Texas, May 12-13, 1995
The conventional quadrupole mass analyzer (Fig. 4) utilizes four parallel cylindrical or hyperbolically shaped rods. The rods are long relative to the inner “kissing circle” diameter, to minimize fringing fields on the active length of the rods. , 1958) for a dc component Uo, and an rf component Vo of frequency Ω. The ions are injected (in the z direction) into the central “flip-flopping” saddle-potential region, and only those ions having the correct mass are transmitted to the exit aperture without sliding into one of the rods.
The release of ionized elements by this laser is rather indiscriminant with regard to siting of an element within the lattice region being ablated. 3. Laser extraction systems. 6 µm Power density 109 W/cm2 800 W/cm2 Spot size 1–2 mm 400 µm (focused 2– 4 mm beam) Thus major elements would be expected to dominate the release spectrum. , 1986; and DeYoung and Situ, 1993). 2 Hz may be reasonable. 3. Laser desorption. The CO2 continuous wave (CW) laser operating at IR wavelengths imparts its energy over a longer duration, allowing for a controlled heating of the sample.
To extract the ions, the amplitude of the RF voltage is increased, causing ions of successively increasing mass to be ejected through one of the end caps into an electron multiplier. The signal from the electron multiplier, typically a channeltron, forms a mass spectrum from which the identification and relative abundances of the gases that were sampled by the QTA are determined. The design of the ion trap analyzer allows for an unprecedented reduction in the weight of the mass spectrometer. A prototype of the analyzer, which fits in the palm of a hand, weighs <100 g, which is less than 10% the weight of a conventional analyzer.
Planetary Surface Instruments Workshop : held at Houston, Texas, May 12-13, 1995 by Charles Meyer; Allan H Treiman; Theodor Kostiuk; Lunar and Planetary Institute.; United States. National Aeronautics and Space Administration