1. Theory of collision effects on atomic and molecular line shapes

   • Paul R. Berman

   Invited Paper Pages: 283 - 296

2. Gain induced stability of active plane-parallel resonators

   • W. J. Witteman
   • G. J. Ernst

   Contributed Papers Pages: 297 - 304

3. A new equilibrium effect in positron trapping in metals

   • P. C. Lichtenberger
   • C. W. Schulte
   • I. K. MacKenzie

   Contributed Papers Pages: 305 - 307

4. Fréedericksz deformation in nematic liquid crystals with frequency dependent dielectric constant

   • G. Baur
   • A. Stieb
   • G. Meier

   Contributed Papers Pages: 309 - 313

5. Effect of an external electric field on the positronium formation in the positron spur

   • O. E. Mogensen

   Contributed Papers Pages: 315 - 322

6. Structure of porous vycor glass and its adsorption characteristics of water —An application of positron annihilation method

   • Yasuo Ito
   • Toshiro Yamashina
   • Michio Nagasaka

   Contributed Papers Pages: 323 - 326

7. Radionuclide emitters for high-temperature measurements on metals using positron annihilation

   • J. L. Campbell
   • C. W. Schulte
   • D. K. Dieterly

   Contributed Papers Pages: 327 - 334

8. High power cw dye lasers

   • B. Wellegehausen
   • L. Laepple
   • H. Welling

   Contributed Papers Pages: 335 - 340

9. Pulsed mercury capillary lamps for dye laser pumping: Spectral measurements

   • P. Dal Pozzo
   • R. Polloni
   • O. Svelto

   Contributed Papers Pages: 341 - 344

10. Effective carrier lifetime and base-widening in shortp ⁺ nn ⁺-diodes

    • W. -D. Drews
    • G. Kesel

    Contributed Papers Pages: 345 - 351

11. Non-stoichiometry and magneto-optic properties of magnetic bubble thin films of TmIG substituted with bismuth and gallium

    • J. M. Robertson
    • J. C. Verplanke
    • A. Op den Buis

    Contributed Papers Pages: 353 - 356

12. Magnetic- and stress-fields of cylindrical non-uniform current density superconducting coils

    • H. Burkhard

    Contributed Papers Pages: 357 - 362

13. A comparative study of oscillator strengths and judd-ofelt intensity parameters of various Nd³⁺-complexes

    • S. S. L. Surana
    • R. C. Mathur
    • S. P. Tandon

    Contributed Papers Pages: 363 - 365

14. Magnetooptical properties of YIG measured on a continuously working spectrometer

    • W. Wettling

    Contributed Papers Pages: 367 - 372

15. CW, single-mode, tunable GaAs laser system with good frequency stability

    • J. L. Picqué
    • S. Roizen
    • O. Testard

    Contributed Papers Pages: 373 - 379

16. Pulsed high-pressure mercury capillary lamps: A new way of pumping dye lasers

    • P. Dal Pozzo
    • R. Polloni
    • O. Svelto

    Letter Paper Pages: 381 - 382

17. Forthcoming papers

    Abstract Pages: 383 - 386

18. Book reviews

    • H. K. V. Lotsch
    • J. J. Hupert
    • G. zu Putlitz

    BookReview Pages: 387 - 388