A new helium mass spectrometer for leak tests, using a novel low pressure analysis cell

Vacuum ◽  
1964 ◽  
Vol 14 (9) ◽  
pp. 378
Keyword(s):  
Mass Spectrometer ◽  
Low Pressure ◽  
Pressure Analysis

scholarly journals Mixing unmixables: Unexpected formation of Li-Cs alloys at low pressure

2015 ◽  
Vol 1 (9) ◽  
pp. e1500669 ◽  
Author(s):  
Serge Desgreniers ◽  
John S. Tse ◽  
Takahiro Matsuoka ◽  
Yasuo Ohishi ◽  
Justin J. Tse
Keyword(s):  
Thermal Expansion ◽  
Theoretical Prediction ◽  
Maximum Entropy Method ◽  
Coefficient Of Thermal Expansion ◽  
Low Pressure ◽  
Entropy Method ◽  
Unexpected Formation ◽  
High Coefficient ◽  
Group I ◽  
Pressure Analysis

Contrary to the empirical Miedema and Hume-Rothery rules and a recent theoretical prediction, we report experimental evidence on the formation of Li-Cs alloys at very low pressure (>0.1 GPa). We also succeeded in synthesizing a pure nonstoichiometric and ordered crystalline phase from an approximately equimolar mixture and resolved its structure using the maximum entropy method. The new alloy has a primitive cubic cell with the Li atom situated in the center and the Cs at the corners. This structure is stable to at least 10 GPa and has an anomalously high coefficient of thermal expansion at low pressure. Analysis of the valence charge density shows that electrons are donated from Cs to the Li “p”-orbitals, resulting in a rare formal oxidation state of −1 for Li. The observation indicates the diversity in the bonding of the seeming simple group I Li element.

scholarly journals A laser and molecular beam mass spectrometer study of low-pressure dimethyl ether flames

2000 ◽  
Vol 28 (2) ◽  
pp. 1647-1653 ◽  
Author(s):  
Andrew Mcilroy ◽  
Toby D. Hain ◽  
Hope A. Michelsen ◽  
Terrill A. Cool
Keyword(s):  
Dimethyl Ether ◽  
Mass Spectrometer ◽  
Molecular Beam ◽  
Low Pressure

Selection of Shale Preparation Protocol and Outgas Procedures for Applications in Low-Pressure Analysis

2017 ◽  
Vol 31 (9) ◽  
pp. 9043-9051 ◽  
Author(s):  
Randall Holmes ◽  
Erik C. Rupp ◽  
Vikram Vishal ◽  
Jennifer Wilcox
Keyword(s):  
Low Pressure ◽  
Selection Of ◽  
Pressure Analysis

Free radicals by mass spectrometry. XL. Primary processes and transient intermediates in the mercury (3P1) photosensitization of hydrazine

1969 ◽  
Vol 47 (8) ◽  
pp. 1391-1393 ◽  
Author(s):  
A. Jones ◽  
F. P. Lossing
Keyword(s):  
Mass Spectrometry ◽  
Free Radicals ◽  
Mass Spectrometer ◽  
Direct Evidence ◽  
Flow Reactor ◽  
Low Pressure ◽  
Primary Decomposition ◽  
Fast Flow ◽  
Transient Intermediates ◽  
Fast Flow Reactor

The low pressure mercury (3P1) photosensitized decomposition of hydrazine has been studied at 55 °C in a fast flow reactor coupled to a mass spectrometer. Direct evidence was obtained for the participation of N2H2, N2H3, NH2, and NH in the decomposition, and two primary decomposition modes were established[Formula: see text]

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