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- J de Urquijo, E Basurto, +4 authors R D White
- The Journal of chemical physics
- 2014

The drift velocity of electrons in mixtures of gaseous water and helium is measured over the range of reduced electric fields 0.1-300 Td using a pulsed-Townsend technique. Admixtures of 1% and 2% water to helium are found to produce negative differential conductivity (NDC), despite NDC being absent from the pure gases. The measured drift velocities are used… (More)

- D Piscitelli, A V Phelps, J de Urquijo, E Basurto, L C Pitchford
- Physical review. E, Statistical, nonlinear, and…
- 2003

The ion mobility or drift velocity data important for modeling glow discharges in rare gas mixtures are not generally available, nor are the ion-neutral scattering cross sections needed to calculate these data. In this paper we propose a set of cross sections for Xe+ and Ne+ collisions with Xe and Ne atoms. Ion mobilities at 300 K calculated using this… (More)

- E Basurto, J de Urquijo, C Cisneros, I Alvarez
- Physical review. E, Statistical, nonlinear, and…
- 2001

This paper reports a drift-tube-mass-spectrometer measurement of the relative abundances of N+ and N+2 in pure nitrogen, over a ratio of electric field to gas density, E/N, from 800 to 7200 Td [1 townsend (Td)=10(-17) V cm(2)]. A proposed charge transfer dissociation scheme between the above two ions and N2 allowed us to obtain spatial rate coefficients for… (More)

- O Sasić, J Jovanović, +4 authors E Basurto
- Physical review. E, Statistical, nonlinear, and…
- 2005

Measurements of electron drift velocities were performed in pure Xe and He and in a number of mixtures ranging up to 70% of Xe. The data were obtained by using a pulsed Townsend technique over the density-normalized electric field strength E/N between 1 and 100 Td . Even for pure gases there are no data in the entire range covered here, and these data… (More)

- E Basurto, J de Urquijo
- Physical review. E, Statistical, nonlinear, and…
- 2001

This paper reports on the mass-analyzed measurement of the drift velocity of the positive SF6 daughter ions, SF+x (x=1-3,5) in the mixture of SF6 with N2 for SF6 concentrations of 10% and 50%. A double mass spectrometer-drift tube was used for these measurements. The density-normalized electric field intensity E/N, was varied from 30 to 360 Td (1 Td=10(-17)… (More)

- J de Urquijo, I Alvarez, C Cisneros
- Physical review. E, Statistical physics, plasmas…
- 1999

Using a pulsed Townsend technique, we have measured the effective ionization coefficient and the electron drift velocities in CHF(3). The density-normalized electric field intensity E/N ranged from 4 to 250 townsends (Td) (1 Td=10(-17) V cm(2)). The E/N value at which the effective ionization coefficient becomes zero was estimated to be 66 Td. For E/N<20… (More)

- M Benhenni, J de Urquijo, +4 authors O Eichwald
- Physical review. E, Statistical, nonlinear, and…
- 2005

The measurement of the mobility of SF-6 in the mixtures SF6 -Ar and SF6 -Xe is reported over the density-reduced electric field strength E/N 1-180 Td (1 Townsend = 10(-17) V cm(2)), from a time-resolved pulsed Townsend technique. Simultaneously, the mobility of SF-6 in the same binary mixtures has been calculated from a set of collision cross sections for… (More)

- J de Urquijo, F B Yousif
- Physical review. E, Statistical, nonlinear, and…
- 2003

This paper deals with the measurement of the mobility of negative ions in the mixtures of SF6 with CF4 and the CH4-Ar (50:50) binary mixture with SF6 contents up to 50%. The pulsed Townsend technique was used to observe the integrated ionic avalanches over a range of the density-reduced electric field E/N for which ionization is either negligible or absent,… (More)

- J C Rodrı́guez-Luna, J de Urquijo
- 2010

A simple, easy to build electronic circuit consisting of an amplifying chain followed by a state-variable bandpass filter has been used to measure the thermal noise produced by a resistor. Using Johnson’s theory for thermal noise, Boltzmann’s constant could be derived with an accuracy of 1.4% of its accepted value. This simple instrument can be very useful… (More)

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