Ion cyclotron resonance spectrometry

The advent of techniques that enable the study of fast reactions in the gas phase, such as ion cyclotron resonance (ICR) spectrometry, Fourier-transform ion cyclotron resonance spectrometry (FT-ICR) and high pressure mass spectrometry (HPMS), allowed the measurement of the gas-phase proton affinities for strong bases84-86 as well as for... 

Boering, K.A. Rolfe, J. Brauman, J.I. Control of Ion Kinetic Energy in Ion Cyclotron Resonance Spectrometry Very-Low-Energy CID. Rapid Commun. Mass Spectrom. 1992, 6, 303-305. 

Energetics Bond energy, (AHB) Calorimetry ir Av h ion cyclotron resonance spectrometry theoretical calculations... 

In the present review, a new variation on an existing experimental method will be used to show how accurate unimolecular dissociation rate constants can be derived for thermal systems. For example, thermal bimolecular reactions are amenable to study by use of several, now well-known, techniques such as (Fourier transform) ion cyclotron resonance spectrometry (FTICR), flowing afterglow (FA), and high-pressure mass spectrometry (HPMS). In systems where a bimolecular reaction leads to products other than a simple association adduct, the bimolecular reaction can always be thought of as containing a unimolecular... 

Lehman, X. A. Bursey, M. M. In Ion Cyclotron Resonance Spectrometry Wiley-Interscience New York, 1976. 

The Mg+—CeHe dissociation energy at 0 K was determined to be 134 4 kJmol (1.39 0.10 eV) using collision induced dissociation and 112 kJmoH by laser photodissociation . Using the radiative association kinetics approach to ion cyclotron resonance spectrometry, the value was shown to be the comparable 1.61 eV (155 kJmoU ). It was also shown that the binding of the second benzene to Mg , i.e. the Mg+ (CeHe)—CgHe bond energy, is less than 1.4 eV (135 kJmoU ). 

Introduction 198 Experimental techniques 200 Ion cyclotron resonance spectrometry 201 Flowing afterglow 203 High pressure mass spectrometry 204 General features of gas-phase ion-molecule reactions 204 Gas-phase SN2 reactions involving negative ions 206 Thermochemical considerations 206 General aspects of gas-phase SN2 reactions 207 Stereochemistry 209... 

Three basic techniques, and variations thereof, have been used in recent years to study aspects of gas-phase ion-molecule reactions pertinent to organic systems they are ion cyclotron resonance spectrometry, flowing afterglow, and high pressure mass spectrometry. The essential feature of these techniques is that ions produced under vacuum are allowed to undergo from few to many collisions with neutrals before they are neutralized at the walls of the instrument. 

Lehman, T. A. and Bursey, M. M. (1976). Ion Cyclotron Resonance Spectrometry". John Wiley and Sons, New York... 

The proton affinities, PA (equation 44), are not determined directly from ICR (ion cyclotron resonance) spectrometry, but entropy terms were instead evaluated in SCF ab initio calculations209. These absolute PA values and those relative to ammonia, APA, are summarized in Table 27209, which also contains the theoretical proton affinities obtained at different levels of theory. 

Excitation for Fourier Transform Ion Cyclotron Resonance Spectrometry," J. Am. Chem. Soc., 107. 7893-7897 (1985). 

Cody, and B. S. Freiser, "Study of Atomic Metal Ions Generated by Laser Ionization, pp. 98-118 in Ion Cyclotron Resonance Spectrometry 2. ed. K.-P. Wanczek, Springer-Verlag, West Germany (1982). 

B. S. Freiser, "Electron Impact Ionization of Argon Ions by Trapped Ion Cyclotron Resonance Spectrometry," Int. J. Mass Spectrom. Ion Proc., 21, 263-267 (1980). 

The BOF2 anion and BOF have been generated and detected in the gas phase by ion cyclotron resonance spectrometry [4], The BOF molecule has been established to have a fluoride affinity that is less than that of BF3. 

The AsOF2 anion has been detected by ion cyclotron resonance spectrometry and shown to transfer a fluoride ion to SiF4 to give AsOF [4],... 

In ion cyclotron resonance spectrometry, a signal results when the cyclotron frequency of an ion, co ( = qH/mc), equals the frequency coq of a marginal oscillator detector. At this point, the ions of a particular mass m and charge q are in resonance, and they absorb power from the marginal oscillator when the... 

As seen for phosgene (see Section 9.12.1.2), ion cyclotron resonance spectrometry is becoming a valuable tool for studying the gas phase reactions of COF with a wide range of ions. 

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