Career Achievements of Professor Lothar Frommhold

Magnus Gustafsson

20th International Conference on Spectral Line ShapesMemorial University of Newfoundland

June 8, 2010

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The years at the University of Hamburg

I Undergraduate studies in Physics and Applied Mathematics

I 1956: Master’s degree in Physics

I 1959: PhD in Physics

I 1959–1964: Research Associate

I 1964: Dr. habil. degree

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The years in the USA

University of Pittsburgh

I 1964–1966: Research Associate

I 1966: Research Professor

University of Texas at Austin

I 1966–1970: Associate Professor

I 1970–present: Full Professor

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Main research areas

(the years are approximate)

I 1956–1974: gas discharges, negative ions, afterglows and dissociativerecombination

I 1972(after some coercion by R.B. Bernstein)–present:collision-induced light scattering

I 1981–present: collision-induced absorption

I 1994–2002: light emitting processes in sonoluminescence

More than 150 refereed publications

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The career also includes:

I A book on collision-induced absorption,on request by A. Dalgarno

(Cambridge University Press, 1993/2006)

I Lothar and Roger Herman brought collision-induced spectroscopy intothe ICSLS in 1988

I Organizer of the 1990 ICSLS in Austin, TexasI Visiting professor at:

I National Bureau of Standards (Washington DC, 1982)I Universidad Nazional (Bogota, Colombia, 1971)I University of Kaiserslautern and Bielefeld (Germany)

I Elected APS fellow since 1971

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Collision-induced absorption in hydrogen

W. Meyer, L. Frommhold, and G. Birnbaum, Phys. Rev. A 1989

I Dots: measurement

I Curves: calculation

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Dimer features in the hydrogen spectrum

I H2 S(0) transition (j : 0→ 2) at354.4 cm−1

I Left of S(0): H2+H2+~ω → (H2)2

I Right of S(0): (H2)2+~ω → H2+H2

I Thick solid curve: Convolution withslit function to simulate the resolutionof the Voyager spectrometer that hasrecorded the Jupiter spectrum

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Emission from Jupiter - recorded by Voyager

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Depolarized Rayleigh scattering in hydrogen

M. Moraldi, A. Borysow, and L. Frommhold, Phys. Rev. A 1989

Experiment (Le Duff and Ouillon):

I Circles: para-H2

I Dots: normal-H2

Calculations:

I Lower curves: para- andnormal-H2 collision-inducedlight scattering

I Upper curve: Rayleigh pluscollision-induced for normal-H2

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Sonoluminescence

D. Hammer and L. Frommhold, Phys. Rev. Lett. 2000

Spectra of rare-gas bubbles at 20◦C:

I solid: experimental for 3He, He, Ne, Ar, Kr, and Xe (Barber et al.)

I dashed: calculated

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Intracollisional interference of HD in a He bath

M. Gustafsson and L. Frommhold, Phys. Rev. A 2001

Experiment (McKellar andRich):

I solid: 1 amagat

I short dashed: 29.4amagats

I long dashed: 205amagats

Calculation representing thelow-pressure limit:

I dots

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Happy Birthday Lothar!

We are looking forward to following yourresearch activities in the years to come.

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