VUV Spectroscopy of Atoms, Molecules and Surfaces

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142 Chapter 6. Two-colour pump-probe experiments on He ... tion and Stark broadening of the 1s2p level. This effect was found to have no influence on the value of the lifetime measured but led to a reduced ion-signal level and should thus be avoided by working at low pressures. An attempt was made to determine relative partial cross sections for ionization of the 1s2p level by measuring the ion signal as a function of the angle between the pump- and probe polarization vectors. The uncertainty on the data was, however, too large and the cross-section values to be deduced too sensitive to the scatter among the data points that quantitative results could be obtained. This situation might be improved by a more careful alignment of the setup and by minimizing and taking more carefully into account the fluctuations (on the order of 10–15 %) and drifts in laser-pulse energies. The two-colour pump-probe technique has only been used for a limited number of experiments of the kind described above but could easily be applied for studies of many other systems. Also, the method should be considered a serious alternative to the pump-probe technique using synchronized laserand synchrotron radiation pulses which has been applied for studies of resonances and many-body effects in atoms [60, 61, 62, 63]. In this respect the present method has the advantages of inherent synchronization of the pumpwith the probe, a simplified setup and a competitive bandwidth—at least in the
References [1] A. Dalgarno and S. Lepp, in Atomic, Molecular and Optical Physics Handbook, edited by G. W. F. Drake (AIP Press, New York, 1996). [2] C. Mendoza, Physica Scripta T65, 198 (1996). [3] K. A. Berrington, in Astrophysical Applications of Powerful New Databases, edited by S. J. Adelman and W. L. Wiese (ASP Conference Series, San Francisco, 1995), Vol. 78. [4] M.J.Seaton,J.Phys.B20, 6363 (1987). [5] K.A.Berringtonet al., J.Phys.B20, 6379 (1987). [6] H. Kjeldsen et al., Astrophys.J.524, L143 (1999). [7] H. Kjeldsen et al., J.Phys.B33, 1403 (2000). [8] E. Biémont et al., Physica Scripts 16, 39 (1977). [9] C.F.Fischer,PhysicaScriptaT83, 49 (1999). [10] T. Brage et al., J.Phys.B32, 3183 (1999). [11] M.-K. Chen, J. Phys. B 27, 865 (1994). [12] E. N. Avgoustoglou et al., Phys.Rev.A57, 4286 (1998). [13] M. Masili et al., J.Phys.B33, 2641 (2000). [14] S.J.Buckman,Rev.Mod.Phys.66, 539 (1994). [15] S. Johansson, in Model Atmospheres and Spectrum Synthesis, editedby S. J. Adelman and W. L. Wiese (ASP Conference Series, San Francisco, 1996), Vol. 108.
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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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10 VUV light generation: possibilit
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18 REFERENCES [14 ] C. R. Vidal, in
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20 REFERENCES [55] C. J. G. Uiterwa
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22 REFERENCES [98] Parameters from
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24 Negative ions ing the binding en
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26 Negative ions located energetica
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28 Negative ions available has been
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30 Negative ions assignment will th
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32 Negative ions feel the repulsion
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34 Negative ions Figure 2.1: Adiaba
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36 Negative ions
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38 REFERENCES [16] E. Kopp, Adv. Sp
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40 REFERENCES [63] P. Balling et al
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42 REFERENCES
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44 High-resolution VUV spectroscopy
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60 REFERENCES [19] J. S. Nielsen an
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62 Lifetimes of molecular negative
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76 REFERENCES [19] V. V. Petrunin e
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78 REFERENCES [66] F. Robicheaux, P
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80 Chapter 5. Femtosecond VUV core-
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Page 102 and 103: 92 Chapter 5. Femtosecond VUV core-
Page 110 and 111: 100 Chapter 5. Femtosecond VUV core
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Page 132 and 133: 122 REFERENCES [61] R. J. Finlay et
Page 134 and 135: 124 REFERENCES [104]R.W.Joyner,inTh
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Page 138 and 139: 128 Chapter 6. Two-colour pump-prob
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Page 156 and 157: 146 REFERENCES [62] S. Baier et al.
Page 158 and 159: 148 The following three chapters ar
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