VUV Spectroscopy of Atoms, Molecules and Surfaces

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58 High-resolution VUV spectroscopy of H − in figure 3.1) [19]. The shape resonance has been investigated a couple of times by Bryant et al. yielding values for the width in the 20–30 meV range while recent theoretical predictions agree on a value around 20 meV [15]. The beam-positioning system appeared to work well but a further evaluation of the success of this experiment will have to avait the data analysis which remains to be done. Considering the series converging to the H(n=3) threshold, the 3 {0} + 3 and 3{0} + 4 Feshbach resonances have been observed by Bryant et al. at 12.650(1) eV and 12.837(4) eV, respectively, applying the doubtfull energy calibration method mentioned previously [7, 35]. With widths of ∼30 meV and ∼2 meV and strengths comparable to those of the 2{0} − 3 and 2{0} − 4 resonances, these states should be easily observable at ASTRID. The intervening 3{0} − 4 and 3{0} − 5 resonances of widths ∼20 µeV and ∼6 µeV [16, 17] have never been observed, but even the lowest-lying one represents an experimental challenge since the strength is a factor of ∼3 lower than that of the 2 {0} − 5 resonance. As an alternative to—or extension of—the present technique, one could consider the use of a tunable VUV light source in an ordinary collinear beamline setup with a low-energy (∼keV) H− beam.Withsuchasetuptheresolution would be limited by the spectral bandwidth of the VUV light source since the contribution from the velocity spread of the accelerated ion beam would be much smaller [36, 37]. The resolution could thus be improved by at least another factor of ∼4by the application of VUV light generated by, e.g., the 5th or 7th harmonic of a nanosecond dye laser. The one- or two-order-ofmagnitude reduction in VUV flux implied by the off-resonant phase-matching conditions would likely be compensated by the improved resolution.
References [1] A.R.P.Rau,J.Astrophys.Astron.17, 113 (1996). [2] K.R.Lykkeet al., Phys.Rev.A43, 6104(1991). [3] G.W.F.Drake,Nucl.Inst.MethB31, 7 (1988). [4] D. C. Rislove et al., Phys.Rev.A58, 1889 (1998). [5] D. C. Rislove et al., Phys.Rev.A59, 906 (1999). [6] H.C.Bryantet al., Phys. Rev. Lett. 38, 228 (1977). [7] M. E. Hamm et al., Phys. Rev. Lett. 43, 1715 (1979). [8] D. W. MacArthur et al., Phys.Rev.A32, 1921 (1985). [9] P.G.Harriset al., Phys.Rev.A42, 6443 (1990). [10] J. Tang et al., Phys.Rev.A49, 1021 (1994). [11] E. Lindroth, Phys. Rev. A 52, 2737 (1995). [12] P. Balling et al., Phys. Rev. Lett. 77, 2905 (1996). [13] H. H. Andersen et al., Phys. Rev. Lett. 79, 4770 (1997). [14] H. R. Sadeghpour et al., Phys.Rev.A45, 1587 (1992). [15] M. Bylicki and C. A. Nicolaides, Phys. Rev. A 61, 052508 (2000). [16] E. Lindroth et al., Phys.Rev.A57, R685 (1998). [17] A. Bürgers and E. Lindroth, Eur. Phys. J. D 10, 327 (2000). [18] T. Purr and H. Friedrich, Phys. Rev. A 57, 4279 (1998).
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VUV Spectroscopy of Atoms, Molecule
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ii CONTENTS 4 .6 Conclusion . . . .
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iv Experimental and theoretical stu
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vi me to the principle of negative-
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viii
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2 VUV light generation: possibiliti
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Page 18 and 19: 8 VUV light generation: possibiliti
Page 20 and 21: 10 VUV light generation: possibilit
Page 28 and 29: 18 REFERENCES [14 ] C. R. Vidal, in
Page 30 and 31: 20 REFERENCES [55] C. J. G. Uiterwa
Page 32 and 33: 22 REFERENCES [98] Parameters from
Page 34 and 35: 24 Negative ions ing the binding en
Page 36 and 37: 26 Negative ions located energetica
Page 38 and 39: 28 Negative ions available has been
Page 40 and 41: 30 Negative ions assignment will th
Page 42 and 43: 32 Negative ions feel the repulsion
Page 44 and 45: 34 Negative ions Figure 2.1: Adiaba
Page 46 and 47: 36 Negative ions
Page 48 and 49: 38 REFERENCES [16] E. Kopp, Adv. Sp
Page 50 and 51: 40 REFERENCES [63] P. Balling et al
Page 52 and 53: 42 REFERENCES
Page 54 and 55: 44 High-resolution VUV spectroscopy
Page 70 and 71: 60 REFERENCES [19] J. S. Nielsen an
Page 72 and 73: 62 Lifetimes of molecular negative
Page 86 and 87: 76 REFERENCES [19] V. V. Petrunin e
Page 88 and 89: 78 REFERENCES [66] F. Robicheaux, P
Page 90 and 91: 80 Chapter 5. Femtosecond VUV core-
Page 110 and 111: 100 Chapter 5. Femtosecond VUV core
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108 Chapter 5. Femtosecond VUV core
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120 REFERENCES [17] A. Cavalleri et
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122 REFERENCES [61] R. J. Finlay et
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124 REFERENCES [104]R.W.Joyner,inTh
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126 REFERENCES [152] T.-C. Chiang,
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128 Chapter 6. Two-colour pump-prob
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144 REFERENCES [16] Information ava
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146 REFERENCES [62] S. Baier et al.
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148 The following three chapters ar
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VUV Spectroscopy of Atoms, Molecules and Surfaces

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