Verlag des Forschungszentrums Jülich
JUEL-4156
Greenland, Philip Thornton; Brezinsek, Sebastijan
On fitting deuterated methylidyne spectra in fusion plasmas
20 S., 2004
We discuss how the spectra of deuterated methylidyne, CD, must be
analysed and .tted to experimental measurements in fusion plasmas, especially plasmas
generated by the JET tokamak. The A 2Δ→X 2∏
spectra can be reasonably well fitted by attributing a single rotational temperature to all three vibrational levels
v = 0, 1, 2, but the vibrational levels themselves are not thermally populated (v = 2
is depleted). Off-diagonal vibrational transitions are negligible. We conclude that
the data are su.ciently well .tted for the ratio of total light emitted from this CD
transition to that observed in the wavelength region 429.4 nm to 430.9 nm to be
calculated to about 6% accuracy. We .nd that there is probably a contamination,
perhaps from the 3D 1∏→2P 1∑ transition in D2
in the 429.4 nm to 430.9 nm observation region.
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