Abstract

We report on the time behavior of ionization signals produced by laser excitation of Ca and Ba atomic vapor to high-Rydberg states. A space-charge-limited thermionic diode detector shows a long-lived (>1-msec) ionization signal. However, optical detection of atomic ions (Ca+, Ba+) shows that these species live for much shorter times (<100 μsec). These results, in conjunction with published results on mass-spectrometric studies of high-density atomic beams, suggest that our ionization signal is primarily due to molecular species (Ca2+, Ba2+). We also observed optically pumped amplified spontaneous emission and stimulated electronic Raman scattering in Ca+ and Ba+.

© 1980 Optical Society of America

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  1. D. Popescu, C. B. Collins, B. W. Johnson, I. Popescu, Phys. Rev. A 9, 1182 (1974); P. Esherick, J. A. Armstrong, R. W. Dreyfus, J. J. Wynne, Phys. Rev. Lett. 36, 1296 (1976); K. C. Harvey, B. P. Stoicheff, Phys. Rev. Lett. 38, 537 (1977).
    [Crossref]
  2. J. A. Armstrong, P. Esherick, J. J. Wynne, Phys. Rev. A 15, 180 (1977).
    [Crossref]
  3. M. Aymar, P. Camus, M. Dieulin, C. Morillon, Phys. Rev. A 18, 2173 (1978).
    [Crossref]
  4. F. L. Mohler, C. Boeckner, J. Res. Nat. Bur. Stand. 5, 399 (1930).
  5. E. F. Worden, J. A. Paisner, J. G. Conway, Opt. Lett. 3, 156 (1978).
    [Crossref] [PubMed]
  6. B. Liu, R. E. Olson, Phys. Rev. A 18, 2498 (1978).
    [Crossref]
  7. E. F. Worden, J. A. Paisner, presented at the American Chemical Society Meeting, Physical Chemistry Section, April 1979, Honolulu, Hawaii, paper 141.
  8. B. Liu, IBM Research Laboratory, San Jose, California 95193, personal communication.

1978 (3)

M. Aymar, P. Camus, M. Dieulin, C. Morillon, Phys. Rev. A 18, 2173 (1978).
[Crossref]

E. F. Worden, J. A. Paisner, J. G. Conway, Opt. Lett. 3, 156 (1978).
[Crossref] [PubMed]

B. Liu, R. E. Olson, Phys. Rev. A 18, 2498 (1978).
[Crossref]

1977 (1)

J. A. Armstrong, P. Esherick, J. J. Wynne, Phys. Rev. A 15, 180 (1977).
[Crossref]

1974 (1)

D. Popescu, C. B. Collins, B. W. Johnson, I. Popescu, Phys. Rev. A 9, 1182 (1974); P. Esherick, J. A. Armstrong, R. W. Dreyfus, J. J. Wynne, Phys. Rev. Lett. 36, 1296 (1976); K. C. Harvey, B. P. Stoicheff, Phys. Rev. Lett. 38, 537 (1977).
[Crossref]

1930 (1)

F. L. Mohler, C. Boeckner, J. Res. Nat. Bur. Stand. 5, 399 (1930).

Armstrong, J. A.

J. A. Armstrong, P. Esherick, J. J. Wynne, Phys. Rev. A 15, 180 (1977).
[Crossref]

Aymar, M.

M. Aymar, P. Camus, M. Dieulin, C. Morillon, Phys. Rev. A 18, 2173 (1978).
[Crossref]

Boeckner, C.

F. L. Mohler, C. Boeckner, J. Res. Nat. Bur. Stand. 5, 399 (1930).

Camus, P.

M. Aymar, P. Camus, M. Dieulin, C. Morillon, Phys. Rev. A 18, 2173 (1978).
[Crossref]

Collins, C. B.

D. Popescu, C. B. Collins, B. W. Johnson, I. Popescu, Phys. Rev. A 9, 1182 (1974); P. Esherick, J. A. Armstrong, R. W. Dreyfus, J. J. Wynne, Phys. Rev. Lett. 36, 1296 (1976); K. C. Harvey, B. P. Stoicheff, Phys. Rev. Lett. 38, 537 (1977).
[Crossref]

Conway, J. G.

Dieulin, M.

M. Aymar, P. Camus, M. Dieulin, C. Morillon, Phys. Rev. A 18, 2173 (1978).
[Crossref]

Esherick, P.

J. A. Armstrong, P. Esherick, J. J. Wynne, Phys. Rev. A 15, 180 (1977).
[Crossref]

Johnson, B. W.

D. Popescu, C. B. Collins, B. W. Johnson, I. Popescu, Phys. Rev. A 9, 1182 (1974); P. Esherick, J. A. Armstrong, R. W. Dreyfus, J. J. Wynne, Phys. Rev. Lett. 36, 1296 (1976); K. C. Harvey, B. P. Stoicheff, Phys. Rev. Lett. 38, 537 (1977).
[Crossref]

Liu, B.

B. Liu, R. E. Olson, Phys. Rev. A 18, 2498 (1978).
[Crossref]

B. Liu, IBM Research Laboratory, San Jose, California 95193, personal communication.

Mohler, F. L.

F. L. Mohler, C. Boeckner, J. Res. Nat. Bur. Stand. 5, 399 (1930).

Morillon, C.

M. Aymar, P. Camus, M. Dieulin, C. Morillon, Phys. Rev. A 18, 2173 (1978).
[Crossref]

Olson, R. E.

B. Liu, R. E. Olson, Phys. Rev. A 18, 2498 (1978).
[Crossref]

Paisner, J. A.

E. F. Worden, J. A. Paisner, J. G. Conway, Opt. Lett. 3, 156 (1978).
[Crossref] [PubMed]

E. F. Worden, J. A. Paisner, presented at the American Chemical Society Meeting, Physical Chemistry Section, April 1979, Honolulu, Hawaii, paper 141.

Popescu, D.

D. Popescu, C. B. Collins, B. W. Johnson, I. Popescu, Phys. Rev. A 9, 1182 (1974); P. Esherick, J. A. Armstrong, R. W. Dreyfus, J. J. Wynne, Phys. Rev. Lett. 36, 1296 (1976); K. C. Harvey, B. P. Stoicheff, Phys. Rev. Lett. 38, 537 (1977).
[Crossref]

Popescu, I.

D. Popescu, C. B. Collins, B. W. Johnson, I. Popescu, Phys. Rev. A 9, 1182 (1974); P. Esherick, J. A. Armstrong, R. W. Dreyfus, J. J. Wynne, Phys. Rev. Lett. 36, 1296 (1976); K. C. Harvey, B. P. Stoicheff, Phys. Rev. Lett. 38, 537 (1977).
[Crossref]

Worden, E. F.

E. F. Worden, J. A. Paisner, J. G. Conway, Opt. Lett. 3, 156 (1978).
[Crossref] [PubMed]

E. F. Worden, J. A. Paisner, presented at the American Chemical Society Meeting, Physical Chemistry Section, April 1979, Honolulu, Hawaii, paper 141.

Wynne, J. J.

J. A. Armstrong, P. Esherick, J. J. Wynne, Phys. Rev. A 15, 180 (1977).
[Crossref]

J. Res. Nat. Bur. Stand. (1)

F. L. Mohler, C. Boeckner, J. Res. Nat. Bur. Stand. 5, 399 (1930).

Opt. Lett. (1)

Phys. Rev. A (4)

B. Liu, R. E. Olson, Phys. Rev. A 18, 2498 (1978).
[Crossref]

D. Popescu, C. B. Collins, B. W. Johnson, I. Popescu, Phys. Rev. A 9, 1182 (1974); P. Esherick, J. A. Armstrong, R. W. Dreyfus, J. J. Wynne, Phys. Rev. Lett. 36, 1296 (1976); K. C. Harvey, B. P. Stoicheff, Phys. Rev. Lett. 38, 537 (1977).
[Crossref]

J. A. Armstrong, P. Esherick, J. J. Wynne, Phys. Rev. A 15, 180 (1977).
[Crossref]

M. Aymar, P. Camus, M. Dieulin, C. Morillon, Phys. Rev. A 18, 2173 (1978).
[Crossref]

Other (2)

E. F. Worden, J. A. Paisner, presented at the American Chemical Society Meeting, Physical Chemistry Section, April 1979, Honolulu, Hawaii, paper 141.

B. Liu, IBM Research Laboratory, San Jose, California 95193, personal communication.

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Figures (4)

Fig. 1
Fig. 1

(a) Schematic of experimental setup used to observe time dependence of ionization signal detected by parallel-plate probes. (b) Typical oscillogram of signal (0.5 V/large division), a composite of ~100 pulses at various delay times t (1 msec/large division) ranging from −1 to 9 msec.

Fig. 2
Fig. 2

Experimental setup for optical excitation and detection of atomic ions.

Fig. 3
Fig. 3

Intensity of ASE at 6142 Å from Ba+ as a function of time delay, τ. The dashed lines connecting the data points show that the ASE signal decays approximately linearly with τ. The oven temperature was 850°C.

Fig. 4
Fig. 4

Series of photos of ASE at 6142 Å for two different He-gas pressures at various τ (μsec). The scale calibrates the actual spot sizes.

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