ISSN:0031-9228    

DOI:10.1063/1.3070920

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3070922

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

May, page 75, column 2—Mildred S. Dresselhaus was not appointed head, but rather associate head of the department of electrical engineering at Massachusetts Institute of Technology for electrical science and engineering.

ISSN:0031-9228    

DOI:10.1063/1.3043317

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

If you squeeze helium‐three along its melting curve, the temperature of the liquid–solid system drops. This unusual but well established cooling occurs because the transition from liquid to solid is, in this case, a change from an ordered to a disordered state; the liquid is a spin‐ordered Fermi liquid, with low entropy, whereas the solid, which has many degrees of freedom, is a highentropy state. Theorists predicted that, if compressive cooling were carried down to low enough temperatures, about 2.1 mK, a spin‐ordering transition would occur in the solid, and it would become a nuclear antiferromagnet. But some recent observations at Cornell indicate that the behavior of He3 is much more complicated than had been anticipated: The experiments, in which temperatures low enough to order the nuclear spins were reached for the first time, show not one but two transitions, and the evidence goes against the existence of a simple antiferromagnetic phase.

ISSN:0031-9228    

DOI:10.1063/1.3070925

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A special evening session on heavyion accelerators was held during the Washington APS meeting to discuss three proposals to build such machines—at Argonne National Laboratory, Oak Ridge National Laboratory and Los Alamos Scientific Laboratory. Although over the years many proposals have been put forth, the field in the US appears to have narrowed down to the three discussed at the meeting.

ISSN:0031-9228    

DOI:10.1063/1.3070926

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Using high‐resolution saturation spectroscopy, Theodore Ha¨nsch, I. S. Shahin and Arthur Schawlow of Stanford University have been able to resolve for the first time single fine‐structure components of the red Balmer lineH&agr;of atomic hydrogen and to observe the Lamb shift directly in the optical absorption spectrum.

ISSN:0031-9228    

DOI:10.1063/1.3070927

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Early in 1969, and as a consequence of extended discussions within and among the Committee on Science and Public Policy of the National Academy of Sciences, the Division of Physical Sciences of the National Resarch Council, the Office of Science and Technology, the President's Science Advisory Committee and several of the major federal agencies that support physics, a decision was reached to initiate a survey of the US physics enterprise. The completed report of the Survey Committee will soon be available. (See box on this Pagefor table of contents.)

ISSN:0031-9228    

DOI:10.1063/1.3070928

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Lasers whose output can be varied over a wide range of frequencies offer the opportunity for a new kind of spectroscopy. These tunable sources are welcome in industry, in environmental monitoring and in medicine as well as in basic research. In absorption spectroscopy, for example, tunable coherent sources are bringing about developments, both evolutionary and revolutionary in character, that recall the way powerful fixed‐frequency lasers revitalized the rather moribund field of Raman spectroscopy a few years ago. And an interesting analogy exists between the klystron and microwave spectroscopy on the one hand and tunable lasers and optical spectroscopy on the other.

ISSN:0031-9228    

DOI:10.1063/1.3070929

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

“A year of sobering reflection for US physicists after a year of unemployment shock and crisis in 1970.” This is how H. William Koch, Director of the American Institute of Physics, characterizes 1971 in his introduction to AIP's annual report where he summarizes what has been learned from this “sobering reflection” as background and context for the particulars that follow.

ISSN:0031-9228    

DOI:10.1063/1.3070930

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3070931

出版商:AIP    

年代:1972

数据来源: AIP