scholarly journals The Mobility of K+ Ions in Helium and Argon

1986 ◽  
Vol 39 (1) ◽  
pp. 25 ◽  
Author(s):  
RA Cassidy ◽  
MT Elford
Keyword(s):  
Mass Spectrometer ◽  
Drift Tube ◽  
Zero Field ◽  
Reduced Mobility

'A drift tube-mass spectrometer has been used to measure the mobility of K + ions in helium at 294 and 80 K over the EIN range 5-60 Td and in argon at 295 K over the EIN range 3-120 Td. The zero field reduced mobility KO for K + in He was determined to be 21� 14 � 0 . 11 cm 2 Y - 1 s - 1 at 294 K and 17 �32�0�26 cm2y-1 s-l at 80 K. The value of KO obtained for K+ in Ar at 295 K is 2 �640�0�013 cm2 y-1 s -1. The results are compared with those obtained in previous measurements.

scholarly journals The Mobility of Li + Ions in Helium and Argon

1985 ◽  
Vol 38 (4) ◽  
pp. 587 ◽  
Author(s):  
RA Cassidy ◽  
MT Elford
Keyword(s):  
Thermal Equilibrium ◽  
Drift Tube ◽  
Cluster Ions ◽  
Zero Field ◽  
Number Density ◽  
Field Mobility ◽  
Mass Spectrometer System ◽  
Cluster Ion ◽  
Spectrometer System ◽  
Reduced Mobility

A drift tube-mass spectrometer system employing Bradbury-Nielsen shutters has been used to measure the mobility of Li + ions in He at 294 and 80 K and Li + ions in Ar at 294 K. The E/N range used was 3 to 80 Td (1 Td == 10 - 21 Y cm2). The zero field reduced mobility for Li + in He was found to be 22�81�0�11 cm2 y-1 s-I at 294 K and 19�64�0�29 cm2 y-1 s-I at 80 K. The value for Li+ in Ar at 294 K is 4�66�0�22 cm2 y-1 s-I. The reduced zero field mobility for the cluster ion Li +. He in He at 80 K and low values of E/ N was found to be 14�84 � 0�22 cm2 y -I s - I. The equilibrium constant for the formation and dissociation of Li + . Ar cluster ions at 294 K was obtained by fitting to the variation of the measured mobility with gas number density at low E/N values. The value obtained, corresponding to thermal equilibrium at 294 K, was (4�0.5)xlO- 19 cm3 .

Very low temperature drift tube mass spectrometer

2000 ◽  
Vol 71 (5) ◽  
pp. 2019-2024 ◽  
Author(s):  
H. Tanuma ◽  
M. Sakamoto ◽  
H. Fujimatsu ◽  
N. Kobayashi
Keyword(s):  
Low Temperature ◽  
Mass Spectrometer ◽  
Drift Tube ◽  
Temperature Drift ◽  
Very Low Temperature

scholarly journals Pressure Dependence and End Effects in Precision Ion Mobility Studies

1974 ◽  
Vol 27 (2) ◽  
pp. 211 ◽  
Author(s):  
MT Elford ◽  
HB Milloy
Keyword(s):  
Pressure Dependence ◽  
Zero Field ◽  
Surface Layers ◽  
End Effects ◽  
Pressure Limit ◽  
Fitting Procedure ◽  
Resonant States ◽  
Mobility Studies ◽  
Cluster Ion ◽  
Reduced Mobility

The mobilities of K + ions have been measured by the Bradbury-Nielsen method in He, Ar, H2 and N 2 at 293 K at pressures and E/Nvalues in the range 1�4-190 torr and 1-28 Td respectively. Three drift tubes were used with drift lengths of 3� 395, 9� 076 and 50�00 cm. The anomalous variation of the reduced mobility with E/ N at low values of E/ N reported by Elford (1971) has been shown to be due to the presence of charged surface layers on the first grid of the time-of-flight system. The dependence of the reduced mobility on pressure also reported by Elford has been confirmed, and an explanation of the pressure dependence in He, Ar and H2 is proposed in terms of the formation of ion-atom or ionmolecule complexes in orbiting resonant states. The zero-field reduced mobilities in the zero-pressure limit have been derived by a fitting procedure and found to be 21 �3 � O' 2, 2�64 � O� 02 and 12� 8 � O' 1 cm2 y-1 S-l for He, Ar and H2 respectively. The pressure dependence of the reduced mobility for K + ions in N2 is shown to be of a different form from the other gases investigated and to be due to the formation of the cluster ion K + . N2. The present data are consistent with the equilibrium constant of Beyer and Keller (1971) for the reaction K + + N2 + N2 +� K + . N2 + N2. The zero-field reduced mobility for K+ ions in N2 in the zero-pressure limit has been found to be 2�50�0�02 cm2 Y-1 s-1.

scholarly journals Ion?Molecule Reactions and Mobilities of SF3+ and SF5+ Ions in SF6 Gas

1993 ◽  
Vol 46 (6) ◽  
pp. 799 ◽  
Author(s):  
ZA Talib ◽  
M Saporoschenko
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Drift Tube ◽  
Ion Source ◽  
Zero Field ◽  
Number Density ◽  
Mobility Data ◽  
Ion Molecule Reactions ◽  
Positive Ion

Positive ion-molecule reactions in 8F6 were studied in a static drift-tube mass spectrometer using electron impact at 100 eY as the ion source. The ratio of electric field strength to gas number density, E / N, was typically varied from 40-282 Td and pressure ranged from 0�1 to o� 8 Torr. The most important processes were found to be 8Ft + SF6 ---+ 8Ft + 8F6 + F2 and 8Ft + 8F6 ---+ (82Fg)+* ---+ 82Ft + F 2. The interaction potentials for the 8Ft and 8Ft ions in SF6 were also found by using the measured mobility data which were obtained using a pulsed-ion transit-time method. We found that the (12,4, a* = 0�1) core model was adequate to describe the mobility over the range of E / N studied. The zero-field reduced mobilities for 8Ft and 8Ft were determined to be 0�68 and 0�55cm2y-1 s- 1 respectively.

scholarly journals Transmission of a Drift Tube Ion Mobility Spectrometer, Connected with a Mass Spectrometer

2015 ◽  
Vol 72 ◽  
pp. 278-282 ◽  
Author(s):  
D.M. Chernyshev ◽  
S.S. Poteshin ◽  
A.V. Karpov ◽  
Alexey A. Sysoev ◽  
Alexander A. Sysoev
Keyword(s):  
Mass Spectrometer ◽  
Ion Mobility ◽  
Drift Tube ◽  
Ion Mobility Spectrometer

scholarly journals The Reaction Rate Coefficient for the Clustering of He to Li + at Low Centre of Mass Energies

1985 ◽  
Vol 38 (4) ◽  
pp. 577 ◽  
Author(s):  
RA Cassidy ◽  
MT Elford
Keyword(s):  
Mass Spectrometer ◽  
Drift Tube ◽  
Reaction Rate ◽  
Rate Coefficient ◽  
Centre Of Mass ◽  
Mass Discrimination ◽  
Reaction Rate Coefficient ◽  
Product Ions

A drift tube-mass spectrometer employing Bradbury-Nielsen grids and the method of Takebe et at. (1982) has been used to determine the reaction rate coefficient for the primary clustering reaction of He to Li + at 80 K at mean centre of mass energies from 10 to 15 meV. The influence of mass discrimination in experiments where reactions are studied by ion sampling of both parent and product ions is discussed.

Cyclodextrin and malto-dextrose collision cross sections determined in a drift tube ion mobility mass spectrometer using nitrogen bath gas

The Analyst ◽  
2018 ◽  
Vol 143 (17) ◽  
pp. 4147-4154 ◽  
Author(s):  
Christian Klein ◽  
Stephanie M. Cologna ◽  
Ruwan T. Kurulugama ◽  
Paul S. Blank ◽  
Ed Darland ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Cross Sections ◽  
Ion Mobility ◽  
Drift Tube ◽  
Collision Cross Sections

Ion mobility measurements indicate unique distributions for cyclodextrin ions.

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