Pulsed ion cyclotron resonance mass spectrometer for studying ion–molecule reactions

1978 ◽  
Vol 49 (1) ◽  
pp. 111-118 ◽  
Author(s):  
Robert T. McIver
Keyword(s):  
Mass Spectrometer ◽  
Cyclotron Resonance ◽  
Ion Cyclotron Resonance ◽  
Ion Molecule Reactions ◽  
Ion Cyclotron

Proton transfer as a first step in ion-molecule reactions of diethyl ether and tetrahydrofuran

1976 ◽  
Vol 29 (8) ◽  
pp. 1837
Author(s):  
T McAllister
Keyword(s):  
Proton Transfer ◽  
Mass Spectrometer ◽  
Diethyl Ether ◽  
Cyclotron Resonance ◽  
Double Resonance ◽  
Ion Cyclotron Resonance ◽  
Ion Molecule Reactions ◽  
Ion Cyclotron

Mechanisms may be written for several of the ion-molecule reactions in tetrahydrofuran and diethyl ether for which the first step is protonation to give the ion (M+l)+. This hypothesis was tested inan ion cyclotron resonance mass spectrometer by double-resonance experiments on mixtures of each of the ethers with methane. It was shown that CH5+ is a precursor for the tetrahydrofuran reactions,but not, with one exception, for the diethyl ether reactions.

Time-resolved ion cyclotron resonance

1978 ◽  
Vol 364 (1718) ◽  
pp. 367-381 ◽  
Keyword(s):  
Cyclotron Resonance ◽  
Low Energy ◽  
Interstellar Space ◽  
Ion Cyclotron Resonance ◽  
Absolute Rate ◽  
Time Resolved ◽  
Ion Molecule Reactions ◽  
Quadrupole Trap ◽  
Ion Cyclotron ◽  
Improved Technique

Ion cyclotron resonance (i. c. r.) is a technique for the study of ion-molecule reactions in the collisional range from thermal to several electron volts. The study of these reactions at low energy has been given impetus by the discovery of their importance in the ionosphere and in interstellar space. This communication identifies some possible weaknesses inherent in current i. c. r. work and suggests an improved technique with which it is possible to determine absolute rate constants more reliably. As an illustration of the technique a measurement of the rate constant for the reaction CH 4 + + CH 4 → k CH 5 + + CH 3 is presented. This value is k = 1.21 ± 0.09 × 10 -15 m 3 s -1 . A new i. c. r. cell design is discussed with which it is hoped to provide further improvement in reliability by the production of a homogeneous radiofrequency field within a true quadrupole trap.

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