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cute breaks op into two atoms, with a
the other Is uncharged.

The Doppler effect we have considering Is
by the " series spectrum" of hydrogen. In to

spectrum hydrogen gives a second spectrum containing a great
number of lines, and this spectrum Is developed,,
not so brightly as the series spectrum, when positive rays pass
through hydrogen. Stark ^l has shown, and his results have
been confirmed by Wilsar,² that the lines in the second spectrum
of hydrogen do not show the Doppler effect with the positive
rays. We infer from this that the second spectrum of hydrogen
is not due to any of the constituents of the positive rays.
This result illustrates the importance of this method for ques-
tions relating to the origin of spectra.

Another illustration of this is the case of oxygen. Oxygen
gives a series spectrum, a spark spectrum which has not been
resolved into series, and some banded spectra. All these
spectra are emitted when oxygen positive rays pass through
oxygen, the spark spectrum being the brightest With oxygen
it is the spark lines that show the Doppler effect. Wilsar
and Paschen could not detect any such effect with the series
lines. Stark, however, who used very large dispersions, found
the effect in some of the lines ; the intensity of the displaced
lines was, however, very small compared with that of the
undisplaced lines, while in the spark lines the displaced
intensity³ is quite comparable with the normal intensity.

Nitrogen has a line spectrum which has not been resolved
into series, and some banded spectra. The line spectrum and one
of the banded spectra are found where nitrogen positive rays
go through nitrogen; the banded spectrum does not show the

¹ Stark, " Ann. der Pfays.," 21, p. 425, 1906.

² " Ann. der Phys.," 39, p. 1251,1912.

³ Paschen, "Ann. der Phys.," 23, p. 261, 1907.



	95 cute breaks op into two atoms, with a the other Is uncharged. The Doppler effect we have considering Is by the " series spectrum" of hydrogen. In to spectrum hydrogen gives a second spectrum containing a great number of lines, and this spectrum Is developed,, not so brightly as the series spectrum, when positive rays pass through hydrogen. Stark ^l has shown, and his results have been confirmed by Wilsar,² that the lines in the second spectrum of hydrogen do not show the Doppler effect with the positive rays. We infer from this that the second spectrum of hydrogen is not due to any of the constituents of the positive rays. This result illustrates the importance of this method for ques- tions relating to the origin of spectra. Another illustration of this is the case of oxygen. Oxygen gives a series spectrum, a spark spectrum which has not been resolved into series, and some banded spectra. All these spectra are emitted when oxygen positive rays pass through oxygen, the spark spectrum being the brightest With oxygen it is the spark lines that show the Doppler effect. Wilsar and Paschen could not detect any such effect with the series lines. Stark, however, who used very large dispersions, found the effect in some of the lines ; the intensity of the displaced lines was, however, very small compared with that of the undisplaced lines, while in the spark lines the displaced intensity³ is quite comparable with the normal intensity. Nitrogen has a line spectrum which has not been resolved into series, and some banded spectra. The line spectrum and one of the banded spectra are found where nitrogen positive rays go through nitrogen; the banded spectrum does not show the ¹ Stark, " Ann. der Pfays.," 21, p. 425, 1906. ² " Ann. der Phys.," 39, p. 1251,1912. ³ Paschen, "Ann. der Phys.," 23, p. 261, 1907.