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2 Prace Naukowe Politechniki Warszawskiej. Elektronika

2 2005

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Mass spectrometric investigations of electron attachment to molecules

Pelc A., Sailer W., Scheier P., Märk T. D.

Prace Naukowe Politechniki Warszawskiej. Elektronika

2005

z. 153

75-78

Low energy electron attachment to nitro compounds (nitromethane, nitroethane and nitrobenzene) in the gas phase is reported in the electron energy range from zero up to about 10 eV with an energy resolution of 120 meV. Dissociative and nondissociative (only in nitrobenzene case) electron attachment were observed. Based on the comparison of the of the abundance of studied ions with CI in the dissociative electron attachment to CCI(4) at 0,8 eV the estimations for the all observed ions were obtained.

Dekorelacja czynników mocy termoelektronowej wiazki jonizującej

Krollopp W. J., Sikora J., Szczepaniak L., Toborek K.

Prace Naukowe Politechniki Warszawskiej. Elektronika

2005

z. 153

181-186

This work proves that correlation between an electron accelerating voltage and a beam intensity has a disadvantageous effect on the measurement results reproducibility erformed with the mass spectrometers and significantly extends total measurement time. The research results in a postulate of making electron accelerating voltage and ionizing beam intensity independent of each other. The conditions that are necessary and sufficient for the implementation of the postulate have been formuleted. A novels the biasing system of an electron source with a hot cathode have is presented. It has been experimentally proved that the biasing system with a hot cathode have is presented. It has been experimentally proved that the biasing system with the implemented decorrelation postulate when applied to measurement instruments makes possible to enhance the reproducibility of the measurements two-folds and to reduce the measurement time by four-folds.