Effect of Temperature on Mass Spectra

FUSAFUMI NAKAO

doi:10.5702/massspec1953.12.25

FUSAFUMI NAKAO

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1964 Volume 12 Issue 25 Pages 25-36

DOI https://doi.org/10.5702/massspec1953.12.25

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Published: May 30, 1964 Received: May 04, 1964 Available on J-STAGE: June 28, 2010 Accepted: - Advance online publication: - Revised: -
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Date of correction: June 28, 2010 Reason for correction: - Correction: ABSTRACT Details: Wrong : The reproducibility and the accuracy of mass spectra are affected by several factors. Among these factors, the effect of ion source temperature has been studied. The ion current intensity of most ions decreases with increasing ion source temperature. The parent ion of hydrocarbons decreases more rapidly than the fragment ions. This effect becomes larger with increasing carbon numbers. The parent ion abundance is reduced with increasing the carbon numbers and the reduction depends upon the ion source temperature. In the experimental temperature range, 100∼300°C, such effects are more pronounced in the complex compounds than in the simple one. The temperature dependency on mass spectra of paraffin compounds is larger than those of olefin and diolefin. Stevenson's hypothesis has been established not only for the inorganic gases but for the parent ion of lower hydrocarbons and their fragmentary ions. It is seen that the α in Stevenson's equation depends upon M -½ for the inorganic gases. Also this relation holds approximately for the parention of hydrocarbons. The kinetic energy due to the effect of ion source temperature is dominant for the inorganic gases and the parent ion of hydrocarbons, while the vibrational energy due to that effect is predominant for the fragmentary ion of hydrocarbons. The temperature coefficient of mass spectra is within 0.2%/°C for rare gases, 0.25%/deg;C for active gases and0. 35%/deg;C for parent ion of hydrocarbons.
Right : The reproducibility and the accuracy of mass spectra are affected by several factors. Among these factors, the effect of ion source temperature has been studied. The ion current intensity of most ions decreases with increasing ion source temperature. The parent ion of hydrocarbons decreases more rapidly than the fragment ions. This effect becomes larger with increasing carbon numbers. The parent ion abundance is reduced with increasing the carbon numbers and the reduction depends upon the ion source temperature. In the experimental temperature range, 100-300°C, such effects are more pronounced in the complex compounds than in the simple one. The temperature dependency on mass spectra of paraffin compounds is larger than those of olefin and diolefin.
Stevenson's hypothesis has been established not only for the inorganic gases but for the parent ion of lower hydrocarbons and their fragmentary ions. It is seen that the a in Stevenson's equation depends upon M-1/2 for the inorganic gases. Also this relation holds approximately for the parention of hydrocarbons. The kinetic energy due to the effect of ion source temperature is dominant for the inorganic gases and the parent ion of hydrocarbons, while the vibrational energy due to that effect is predominant for the fragmentary ion of hydrocarbons.
The temperature coefficient of mass spectra is within 0.2 %/°C for rare gases, 0.25%/deg;C for active gases and0. 35%/deg;C for parent ion of hydrocarbons.

Date of correction: June 28, 2010 Reason for correction: - Correction: CITATION Details: Wrong : E
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Right : R. E. Fox and J. A. Hipple, J. Chem. Phys., 15, 208(1947).
H. W. Washburn and C. E. Berry, Phys. Rev., 70, 559(1946).
N. D. Coggeshall, J. Chem. Phys. 12, 1164(1944).
C. E. Berry, ibid., 17, 1164(1949).
R. M. Reese et al., Phys. Rev., 78, 332(1950).
V. H. Erhardt and O. Osberghaus, Z. Naturejorschg., 15a, 575(1960).
F. Nakao, Natl. Tech. Rep., 9, 499(1963).
D. P. Stevenson, J. Chem. Phys., 17, 101(1949).
A. O. Nier Rev. Sci. Instr., 18, 398(1947).
“Advances in Mass Spectrometry”, p193, Pergamon Press(1959).

Date of correction: June 28, 2010 Reason for correction: - Correction: PDF FILE Details: -

Abstract

The reproducibility and the accuracy of mass spectra are affected by several factors. Among these factors, the effect of ion source temperature has been studied. The ion current intensity of most ions decreases with increasing ion source temperature. The parent ion of hydrocarbons decreases more rapidly than the fragment ions. This effect becomes larger with increasing carbon numbers. The parent ion abundance is reduced with increasing the carbon numbers and the reduction depends upon the ion source temperature. In the experimental temperature range, 100-300°C, such effects are more pronounced in the complex compounds than in the simple one. The temperature dependency on mass spectra of paraffin compounds is larger than those of olefin and diolefin.
Stevenson's hypothesis has been established not only for the inorganic gases but for the parent ion of lower hydrocarbons and their fragmentary ions. It is seen that the a in Stevenson's equation depends upon M-1/2 for the inorganic gases. Also this relation holds approximately for the parention of hydrocarbons. The kinetic energy due to the effect of ion source temperature is dominant for the inorganic gases and the parent ion of hydrocarbons, while the vibrational energy due to that effect is predominant for the fragmentary ion of hydrocarbons.
The temperature coefficient of mass spectra is within 0.2 %/°C for rare gases, 0.25%/deg;C for active gases and0. 35%/deg;C for parent ion of hydrocarbons.

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