1. Titles of forthcoming papers

   Legacy Pages: A5 - A5

2. Superconductivity

   • M. Brian Maple

   Invited Paper Pages: 179 - 204

3. Tuning properties of a birefringent Fabry-Pérot etalon

   • D. Frölich
   • H. Welling

   Contributed Papers Pages: 205 - 207

4. Das Strom-Spannungs-Widerstands-Ersatzschaltbild von Elektreten

   • Günter Morgenstern

   Contributed Papers Pages: 209 - 215

5. ESCA studies of chemical shifts for metal oxides

   • R. Holm
   • S. Storp

   Contributed Papers Pages: 217 - 222

6. Optimization of the parameters of the ideal 180° spherical analyzer

   • Hans Dietrich Polaschegg

   Contributed Papers Pages: 223 - 227

7. Spectral line narrowing in a gas by atoms trapped in a standing light wave

   • V. S. Letokhov
   • B. D. Pavlik

   Contributed Papers Pages: 229 - 237

8. Doppler-free resonant two-photon transition for isotope separation

   • Koichi Shimoda

   Contributed Papers Pages: 239 - 246

9. Fast LEED-intensity measurements with a computer controlled television system

   • P. Heilmann
   • E. Lang
   • K. Müller

   Contributed Papers Pages: 247 - 251

10. Effects of interstitial oxygen and nitrogen on the mechanical properties of niobium-titanium alloys

    • R. Cantelli
    • Z. C. Szkopiak

    Contributed Papers Pages: 253 - 257

11. Positron systematics in annealed metals

    • I. K. MacKenzie
    • T. E. Jackman
    • P. C. Lichtenberger

    Letter Paper Pages: 259 - 260

12. Forthcoming papers

    Abstract Pages: 261 - 263

13. Book reviews

    • J. Zittartz
    • M. Sargent
    • P. Hertel

    BookReview Pages: 264 - 265