Ionization Potentials and Probabilities Using a Mass Spectrometer

Fox, Ronald F.; Hickam, W. M.; Kjeldaas, T.; Grove, D.J.

doi:10.1103/physrev.84.859

Cited by 127 publications

(19 citation statements)

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“…The relative uncertainty δ( σ el )/ σ el , estimated by comparing the calculated dσ el /d with available experimental data [19,20], amounted to 50%. The derivative ∂σ t /∂T was determined using the cubic interpolation of the experimental results and δT was set equal to the uncertainty of the calibration of the electron energy that has been carried out before by means of the retarding field method [11,21].…”

Section: Methodsmentioning

confidence: 99%

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Total electron-scattering cross sections of pyrimidine

et al. 2013

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Total electron-scattering cross sections of pyrimidine, the basic component for the nucleic bases cytosine and thymine, were measured for electron energies from 5 eV to 1 keV using the linear transmission method. The measured results were compared to semiempirical data obtained by means of the additivity rule and to experimental data for benzene since it has a similar ring structure and the same number of valence electrons as pyrimidine. Furthermore, integral elastic and inelastic electron-scattering cross sections of pyrimidine were calculated by applying the spherical complex optical potential model. The sum of both cross sections agrees reasonably well with the experimental total electron-scattering cross sections of pyrimidine in the energy range from 20 eV to 1 keV. The experimental data are, however, significantly lower than the theoretical cross sections when including the contribution of rotational excitations to the electron scattering. Total electron-scattering cross sections of pyrimidine, the basic component for the nucleic bases cytosine and thymine, were measured for electron energies from 5 eV to 1 keV using the linear transmission method. The measured results were compared to semiempirical data obtained by means of the additivity rule and to experimental data for benzene since it has a similar ring structure and the same number of valence electrons as pyrimidine. Furthermore, integral elastic and inelastic electron-scattering cross sections of pyrimidine were calculated by applying the spherical complex optical potential model. The sum of both cross sections agrees reasonably well with the experimental total electron-scattering cross sections of pyrimidine in the energy range from 20 eV to 1 keV. The experimental data are, however, significantly lower than the theoretical cross sections when including the contribution of rotational excitations to the electron scattering.

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Section: Methodsmentioning

confidence: 99%

“…(21). According to the formula of Collins and Norcross [35], which is based on the first Born approximation for a rotating dipole, the integral cross section for rotational excitation is given by…”

Section: Theoretical Methodsmentioning

confidence: 99%

Total electron-scattering cross sections of pyrimidine

et al. 2013

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“…Retarding potential difference involves the manipulation of electrons thermionically emitted from a filament in such a way that a beam of ''quasi-monoenergetic'' electrons is simulated (see Fox, Hickam, & Grove, 1951;Fox, Hickam, & Kjeldaas, 1953;Fox et al, 1955). The energy distribution of electrons from a filament possesses a wide energy distribution ($0.5 eV FWHM) due to the one-dimensional Maxwell Boltzmann energy distribution.…”

Section: A Retarding Potential Difference (Rpd) Methodsmentioning

confidence: 99%

Electron ionization time‐of‐flight mass spectrometry: Historical review and current applications

Mirsaleh-Kohan

Robertson

Compton

2008

Mass Spectrometry Reviews

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This review presents an overview of electron ionization time-of-flight mass spectroscopy (EITOFMS), beginning with its early development to the employment of modern high-resolution electron ionization sources. The EITOFMS is demonstrated to be ideally suited for analytical and basic chemical physics studies. Studies of the formation of positive ions by electron ionization time-of-flight mass spectroscopy have been responsible for many of the known ionization potentials of molecules and radicals, as well as accepted bond dissociation energies for ions and neutral molecules. The application of TOFMS has been particularly important in the area of negative ion physics and chemistry. A wide variety of negative ion properties have been discovered and studied by using these methods including: autodetachment lifetimes, metastable dissociation, Rydberg electron transfer reactions and field detachment, SF(6) Scavenger method for detecting temporary negative ion states, and many others.

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“…As a consequence, the measurement of negative-ion appearance potentials is considerably more difficult than that of positive-ion appearance potentials. The retarding potential difference method of Fox et al (1951) has given results on standard reference materials to within 0.1 eV of the spectroscopic values for positive ions. Comparable accuracy can be expected when this method is used for negative ions.…”

Section: Charge Permutation [A'b + ] + Ab -> [A'b-] + (Ab) (3-14)mentioning

confidence: 98%

The Mass Spectrum

Hamming

1972

Interpretation of Mass Spectra of Organic Compounds

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Ionization Potentials and Probabilities Using a Mass Spectrometer

Cited by 127 publications

References 1 publication

Total electron-scattering cross sections of pyrimidine

Total electron-scattering cross sections of pyrimidine

Electron ionization time‐of‐flight mass spectrometry: Historical review and current applications

The Mass Spectrum

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