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Pulsed Optical Pumping in Low-Pressure Mercury Discharges

  • P. van de Weijer
  • R. M. M. Cremers
Part of the NATO ASI Series book series (ASIB, volume 149)

Abstract

A good understanding of the fundamental processes occurring in the positive column of low-pressure mercury-noble-gas discharges is of practical interest because these discharges are used in fluorescent lamps (Elenbaas, 1959; Waymouth, 1971). In these lamps the light production is mainly due to mercury UV resonance radiation originating from the 6 3P1 and 6 1P1 levels at 254 and 185 nm, respectively (Fig. 1). This UV radiation is converted into visible radiation by a coating of fluorescent powder on the inside of the discharge tube. Once a mercury UV resonance photon has been produced in the volume of the discharge it is absorbed and re-emitted many times before it escapes from the discharge. Due to this process, called trapping or imprisonment, the effective radiative lifetime of the 6 3P1 and 6 1P1 level can be considerably longer than the natural radiative lifetime. The longer the effective radiative lifetime, the greater the possibility that the energy will be released via a non-radiative process. Thus, a detailed knowledge of the effective radiative lifetime of the 6 3P1 and 6 1P1 levels as a function of the discharge parameters may be of help in the development of more efficient fluorescent lamps.

Keywords

Radiative Decay Discharge Tube Amplify Spontaneous Emission Radiative Lifetime Mercury Atom 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • P. van de Weijer
    • 1
  • R. M. M. Cremers
    • 1
  1. 1.Philips Research LaboratoriesEindhovenThe Netherlands

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