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20 Mar 2000

Volume 76, Issue 12, pp. 1489-1630

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Mercury depletion as a way of changing the emission spectrum of a fluorescent lamp

L. P. Bakker and G. M. W. Kroesen

Appl. Phys. Lett. 76, 1528 (2000); http://dx.doi.org/10.1063/1.126085 (3 pages) | Cited 7 times

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We present a promising option for changing the emission spectrum of a fluorescent lamp. In a neon/mercury discharge, neon radiation is produced when the mercury density is sufficiently low. Under certain discharge conditions, radial cathaphoresis causes depletion of mercury atoms in the center of the plasma. This effect is especially well pronounced at high electrical currents and low mercury pressures. We measured the color temperature of a fluorescent lamp containing a neon/mercury discharge at several mercury pressures and currents. The color temperature of this lamp varied from 4000 to 2100 K. We also performed ultraviolet absorption measurements. From these measurements, we obtained the mercury atom density profile in the discharge. A significant decrease of the mercury density in the center of the plasma is indeed observed under certain discharge conditions. © 2000 American Institute of Physics.
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52.80.Yr Discharges for spectral sources (including inductively coupled plasma)
42.72.Bj Visible and ultraviolet sources

Magnetic-field-dependent plasma composition of a pulsed arc in a high-vacuum ambient

Jochen M. Schneider, André Anders, Björgvin Hjörvarsson, and Lars Hultman

Appl. Phys. Lett. 76, 1531 (2000); http://dx.doi.org/10.1063/1.126086 (3 pages) | Cited 13 times

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The effect of a magnetic field on the plasma composition of a pulsed Au plasma stream in a high-vacuum ambient is described. The plasma was formed with a pulsed vacuum-arc-plasma source, and the time-resolved plasma composition was measured with time-of-flight charge-to-mass spectrometry. Plasma impurities due to ionization of nonmetallic species (H+, O+, and N+) were found to be below the detection limit in the absence of a magnetic field. However, in the presence of a magnetic field (0.4 T), the contribution of ionized nonmetal species to the plasma composition was up to 0.22 atomic ratio. These results are characteristic of plasma-based techniques where magnetic fields are employed in a high-vacuum ambient. In effect, the impurity incorporation during thin-film growth pertains to the present findings. © 2000 American Institute of Physics.
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52.25.Vy Impurities in plasmas
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.80.Vp Discharge in vacuum
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