Radiative emission from metastable multiply charged ions of importance in space plasmas

Details Radiative emission from metastable multiply charged ions of importance in space plasmas Radiative emission from metastable multiply charged ions of importance in space plasmas

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..gecjtp402g&link_type=abstract

American Physical Society, Gaseous Electronics Conference, October 5-9, 1997, abstract #JTP.402

Astronomy and Astrophysics

Astrophysics

Scientific paper

With the launch of satellites capable of observing in the ultra-violet region, emission from a number of forbidden transitions in multiply charged ions has been observed [1]. The radiative rates for metastable states of these ions in diffuse interstellar, stellar, solar and planetary plasmas are comparable to the collisional rates. These emissions can be used to determine the electron temperature and density, if accurate values for the metastable radiative rates are available. We will be presenting preliminary results of metastable lifetimes of astrophysically important ions measured in a Kingdon ion trap. The experiment generates metastable multiply charged ions in an electron cyclotron resonance ion source. The ions are directed into the cylindrical electrostatic ion trap where confinement is achieved by a fast kilovolt pulse on the central wire of the trap. The photons emitted from the metastable state of interest are selected by a narrow bandpass filter and detected by a photomultiplier. From the time decay of the photon signal one determines the lifetime of the state. [1] K. R. Sembach et al., Ap. J. 480, 216 (1997).

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