Abstract

An apparatus has been developed for the study of the afterglow of a rare-earth spark with a time resolution of 0.1 μsec. A hydrogen thyratron controls a rapidly firing spark gap and the spectrum of the afterglow is recorded with pulsed photomultipliers and ratio techniques. Tests with preseodymium have shown that it is possible to separate lines according to the ion of origin for the second, third, and fourth spectra, according to configuration of origin in the third spectrum of praseodymium, for example, the emission lines of the 4f26p–4f26s and 4f25d–4f3 transitions. In the case of the 4f25d–4f3 transition, some terms of the 4f25d configuration are indicated from the more intense lines. The methods developed with praseodymium have been applied to neodymium, and some preliminary results are reported.

© 1962 Optical Society of America

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References

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  1. D. W. Steinhaus, H. M. Crosswhite, and G. H. Dieke, Spectrochim. Acta 5, 436 (1953).
    [CrossRef]
  2. G. H. Dieke, H. M. Crosswhite, and B. Dunn, J. Opt. Soc. Am. 51, 820 (1961).
    [CrossRef]
  3. J. Sugar, “The spectra of doubly and triply ionized praseodymium,” dissertation, The Johns Hopkins University, 1960.
  4. W. G. Fastie, J. Opt. Soc. Am. 42, 641 (1952).
    [CrossRef]
  5. C. Hendee and W. Brown, Phillips Tech. Rev. 19, 50 (1957).

1961 (1)

1957 (1)

C. Hendee and W. Brown, Phillips Tech. Rev. 19, 50 (1957).

1953 (1)

D. W. Steinhaus, H. M. Crosswhite, and G. H. Dieke, Spectrochim. Acta 5, 436 (1953).
[CrossRef]

1952 (1)

Brown, W.

C. Hendee and W. Brown, Phillips Tech. Rev. 19, 50 (1957).

Crosswhite, H. M.

G. H. Dieke, H. M. Crosswhite, and B. Dunn, J. Opt. Soc. Am. 51, 820 (1961).
[CrossRef]

D. W. Steinhaus, H. M. Crosswhite, and G. H. Dieke, Spectrochim. Acta 5, 436 (1953).
[CrossRef]

Dieke, G. H.

G. H. Dieke, H. M. Crosswhite, and B. Dunn, J. Opt. Soc. Am. 51, 820 (1961).
[CrossRef]

D. W. Steinhaus, H. M. Crosswhite, and G. H. Dieke, Spectrochim. Acta 5, 436 (1953).
[CrossRef]

Dunn, B.

Fastie, W. G.

Hendee, C.

C. Hendee and W. Brown, Phillips Tech. Rev. 19, 50 (1957).

Steinhaus, D. W.

D. W. Steinhaus, H. M. Crosswhite, and G. H. Dieke, Spectrochim. Acta 5, 436 (1953).
[CrossRef]

Sugar, J.

J. Sugar, “The spectra of doubly and triply ionized praseodymium,” dissertation, The Johns Hopkins University, 1960.

J. Opt. Soc. Am. (2)

Phillips Tech. Rev. (1)

C. Hendee and W. Brown, Phillips Tech. Rev. 19, 50 (1957).

Spectrochim. Acta (1)

D. W. Steinhaus, H. M. Crosswhite, and G. H. Dieke, Spectrochim. Acta 5, 436 (1953).
[CrossRef]

Other (1)

J. Sugar, “The spectra of doubly and triply ionized praseodymium,” dissertation, The Johns Hopkins University, 1960.

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Figures (14)

Fig. 1
Fig. 1

Spark circuit for short, rapidly repetitive sparks.

Fig. 2
Fig. 2

Cross-section view of spark chamber showing electrodes mounted in Lavite holder.

Fig. 3
Fig. 3

Perspective view of Lavite holder for spark electrodes.

Fig. 4
Fig. 4

Optical arrangement for time-resolved spectroscopy.

Fig. 5
Fig. 5

Block diagram of electronics for fast time resolution.

Fig. 6
Fig. 6

Circuit diagram for delay line pulser of photomultiplier voltage.

Fig. 7
Fig. 7

Electrometer for pulsed photomultiplier output when scanning in wavelength.

Fig. 8
Fig. 8

Intensity of Pr iii and Pr iv spectrum lines vs time in afterglow.

Fig. 9
Fig. 9

Intensity of Pr ii and Pr iii spectrum lines vs time in afterglow.

Fig. 10
Fig. 10

Energy level configurations of Pr ion.

Fig. 11
Fig. 11

Decay curves of some 4f26p, 4f26s, and 4f25d—4f3 transitions in Pr iii spectrum.

Fig. 12
Fig. 12

Decay curves of four intense transitions from 4f25d to 4f3.

Fig. 13
Fig. 13

Decay time vs initial energy level for lines of the Pr iii spectrum.

Fig. 14
Fig. 14

Traces at 0.6 and 1.0 μsec in the afterglow of a praseodymium spark.