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VUV Spectroscopy of Atoms, Molecules and Surfaces

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Contents<br />

Preface iii<br />

1 <strong>VUV</strong> light generation: possibilities <strong>and</strong> limitations 1<br />

1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1<br />

1.2 Frequency mixing . . . . . . . . . . . . . . . . . . . . . . . . . 4<br />

1.3 High-harmonic generation . . . . . . . . . . . . . . . . . . . . 6<br />

1.4Comparison with other methods <strong>of</strong> <strong>VUV</strong> light- <strong>and</strong> X-ray generation<br />

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13<br />

2 Negative ions 23<br />

2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23<br />

2.2 Negative-ionstructure ...................... 24<br />

2.3 Status on negative-ion knowledge . . . . . . . . . . . . . . . . 26<br />

2.4Theoretical approaches to negative-ion<br />

structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29<br />

2.4.1 Computational methods . . . . . . . . . . . . . . . . . 29<br />

2.4.2 The hyperspherical-coordinate approach . . . . . . . . 32<br />

3 High-resolution <strong>VUV</strong> spectroscopy <strong>of</strong> H − 43<br />

3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3<br />

3.2 Experimental approach. . . . . . . . . . . . . . . . . . . . . . 4 6<br />

3.3 Results<strong>and</strong>discussion ...................... 50<br />

3.4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56<br />

4<br />

4<br />

4 Lifetimes <strong>of</strong> molecular negative ions 61<br />

.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61<br />

4.2 Notation <strong>and</strong> molecular quantum numbers . . . . . . . . . . . 63<br />

.3 Experimental setup . . . . . . . . . . . . . . . . . . . . . . . . 64<br />

4.4 N − 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<br />

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<br />

65<br />

68<br />

4.5 CO − 2

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