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Our rapid-scan spectrograph has been modified to provide a means of recording many time-resolved profiles of one emission line from a transient plasma. This is accomplished by scanning an emission line across an array of closely spaced exit slits. Post-optics have been designed which direct the radiation from each slit to the same photomultiplier tube. At a spectral scan speed of 120 Å/μsec, an emission line profile has been scanned every 1.4 μsec; however, with closer spaced slits, this time could be easily halved. This device has been used to obtain Stark-broadened Hα and Hβ line profiles from hydrogen heated in an impulse tube. Electron densities obtained by fitting the line wings of Hα compare very well with values obtained from the half-width of Hβ.
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Ronald A. Hill (1965) studied this question.
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