Two National Bureau of Standards Data Centers: Chemical Kinetics and Mass Spectrometry

1967 ◽  
Vol 7 (1) ◽  
pp. 31-34 ◽  
Author(s):  
David. Garvin ◽  
Henery M. Rosenstock
Keyword(s):  
Mass Spectrometry ◽  
Chemical Kinetics ◽  
Data Centers ◽  
National Bureau

Gas Phase and Surface Reactions of Organometallic Arsenic Sources

1989 ◽  
Vol 145 ◽  
Author(s):  
T.R. Omstead ◽  
S. Brandon ◽  
M. Hoveland ◽  
K.F. Jensen ◽  
D.A. Bohling ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Growth Rate ◽  
Gas Phase ◽  
Chemical Kinetics ◽  
Molecular Beam ◽  
Surface Reactions ◽  
Molecular Beam Mass Spectrometry ◽  
The Common ◽  
Kinetics Of

AbstractThe chemical kinetics of two new organometallic arsenic substitutes, tris-trifluoromethylarsenic (As(CF3)3) and phenylarsine (PhAsH2), for use in the MOCVD of GaAs have been characterized through the use of microbalance gravimetry and molecular beam mass spectrometry. Both growth rate and gas-phase cracking studies demonstrate that phenylarsine interacts only slightly with the common gallium precursors, which may make it a useful alternative to arsine. Growth with tris-trifluoromethylarsenic is achieved only at low V/III ratios and with pressures above 250 Torr. The compound etches GaAs under most conditions.

scholarly journals Concluding Remarks

1977 ◽  
Vol 35 ◽  
pp. 293-294
Author(s):  
R. H. Garstang
Keyword(s):  
Special Interest ◽  
Spectroscopic Data ◽  
Quality Index ◽  
Data Centers ◽  
Original Data ◽  
Probable Error ◽  
National Bureau ◽  
The Past ◽  
Best Value ◽  
Comprehensive Compilation

When listening to the papers which have been presented I was struck by the feeling that much more effort is being devoted to the problems of the acquisition and handling of vast quantities of data than to the evaluation and presentation of the data, a situation which has in the past applied to spectroscopic data as well. The list of Data Centers which Dr. Jaschek presented attests to the efforts now underway to collect data. I would therefore urge strenuous attempts to critically evaluate collections of data whenever such evaluation is meaningful and feasible. I believe that many of our colleagues expect us to tell them a ‘best’ value for any particular datum, with, if possible, an indication of whether it is considered trustworthy (by a probable error or a quality index). I believe that this principle of giving the best representative values underlies much of the success of C. W. Allen’s book Astrophysical Quantities as well as of compilations such as the National Bureau of Standards spectroscopic publications. I would also emphasize the continuing value of bibliographies, at least in cases when the original data are published in widely scattered articles and until the publication of a comprehensive compilation. I believe that good bibliographies on topics of special interest could go far to meeting the casual needs of many users of our data.

Measurement of cholesterol in serum by gas chromatography/mass spectrometry at moderate mass resolution, with a nonendogenous cholesterol isomer as internal standard.

1988 ◽  
Vol 34 (3) ◽  
pp. 531-534 ◽  
Author(s):  
M Kinter ◽  
D A Herold ◽  
J Hundley ◽  
M R Wills ◽  
J Savory
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Internal Standard ◽  
Reference Method ◽  
Gas Chromatography Mass Spectrometry ◽  
Structural Isomer ◽  
National Bureau ◽  
Chromatography Mass Spectrometry ◽  
Reference Serum ◽  
Primary Advantage

Abstract We describe a gas chromatography/mass spectrometry method for the quantitative analysis of cholesterol in serum. A structural isomer of cholesterol, 7,(5 alpha)-cholesten-3 beta-ol, is used as an internal standard, its primary advantage being its lesser cost relative to that of a stable-isotope-labeled analog. Analysis of the National Bureau of Standards Certified Reference Serum (SRM 909) was used to validate the method. The results show this method to be highly accurate (bias = -0.6%) and precise (CV = 1.6% between-run, 1.2% within-run). The performance of this method is, therefore, sufficiently good to allow its use as a reference method for determinations of cholesterol in serum.

Sign in / Sign up

Export Citation Format

Share Document