Degenerate Fermi gas of (87)Sr.

We report quantum degeneracy in a gas of ultracold fermionic (87)Sr atoms. By evaporatively cooling a mixture of spin states in an optical dipole trap for 10.5 s, we obtain samples well into the degenerate regime with T/T(F)=0.26(-0.06)(+0.05). The main signature of degeneracy is a change in the momentum distribution as measured by time-of-flight imaging, and we also observe a decrease in evaporation efficiency below T/T(F) ∼0.5.

Bose-Einstein condensation of 84Sr.

We report Bose-Einstein condensation of (84)Sr in an optical dipole trap. Efficient laser cooling on the narrow intercombination line and an ideal s-wave scattering length allow the creation of large condensates (N(0) approximately 3 x 10(5)) even though the natural abundance of this isotope is only 0.6%. Condensation is heralded by the emergence of a low-velocity component in time-of-flight images.

Spectroscopic determination of the s-wave scattering lengths of 86Sr and 88Sr.

We report the use of photoassociative spectroscopy to determine the ground-state s-wave scattering lengths for the main bosonic isotopes of strontium, 86Sr and 88Sr. Photoassociative transitions are driven with a laser red detuned by up to 1400 GHz from the 1S0-1P1 atomic resonance at 461 nm. A minimum in the transition amplitude for 86Sr at -494 +/- 5 GHz allows us to determine the scattering lengths 610a0 < a86 < 2300a0 for 86Sr and a much smaller value of -1a0 < a88 < 13a0 for 88Sr.

Photoassociative spectroscopy at long range in ultracold strontium.

We report photoassociative spectroscopy of 88Sr(2) in a magneto-optical trap operating on the 1S0-->3P1 intercombination line at 689 nm. Photoassociative transitions are driven with a laser red detuned by 600-2400 MHz from the 1S0-->1P1 atomic resonance at 461 nm. Photoassociation takes place at extremely large internuclear separation, and the photoassociative spectrum is strongly affected by relativistic retardation. A fit of the transition frequencies determines the 1P1 atomic lifetime (tau=5.22+/-0.03 ns) and resolves a discrepancy between experiment and recent theoretical calculations.

Using absorption imaging to study ion dynamics in an ultracold neutral plasma.

We report optical absorption imaging of ultracold neutral strontium plasmas. The ion absorption spectrum determined from the images is Doppler broadened and thus provides a quantitative measure of the ion kinetic energy. For the particular plasma conditions studied, ions heat rapidly as they equilibrate during the first 250 ns after plasma formation. Equilibration leaves ions on the border between the weakly coupled gaseous and strongly coupled liquid states. On a longer time scale of microseconds, pressure exerted by the trapped electron gas accelerates the ions radially.

Electron screening and kinetic-energy oscillations in a strongly coupled plasma.

We study equilibration of strongly coupled ions in an ultracold neutral plasma produced by photoionizing laser-cooled and trapped atoms. By varying the electron temperature, we show that electron screening modifies the equilibrium ion temperature. Even with few electrons in a Debye sphere, the screening is well described by a model using a Yukawa ion-ion potential. We also observe damped oscillations of the ion kinetic energy that are a unique feature of equilibration of a strongly coupled plasma.

Development of a MeSH-based index of faculty research interests.

An index of faculty research interests terms has many uses for an institution's researchers and administrators. This paper describes the Faculty Research Interests Project (FRIP), which addresses vocabulary and compliance problems inherent in research interests index development. FRIP creates an index using Medical Subject Headings (MeSH) associated with the MEDLINE-indexed publications of faculty authors. Following a preliminary study, a Web-based term selection component was developed that allows faculty users not only to choose MeSH terms but also to add both additional author names under which they have published and original terms in real time. In a study involving 136 medical school faculty, users successfully navigated the term selection component, and more than 90 percent of the terms they selected were MeSH terms, confirming MeSH's usefulness for indexing research interests.

Transforming the present--discovering the future: the University of Pittsburgh's NLM grant on education and training of health sciences librarians.

BACKGROUND: The University of Pittsburgh was awarded a grant by the National Library of Medicine to study the education and training needs of present and future medical librarians and health information specialists through a collaboration of the university's School of Information Sciences and Health Sciences Library System. Goals and objectives for the year-long project included (1) assessment of education and training needs of medical librarians, (2) development of a master of library science curriculum and an internship program that would prepare graduates to take leadership roles in medical librarianship or information management, (3) development of continuing education programs for medical librarians in different formats, and (4) development of targeted recruitment efforts to attract minority group members and individuals with undergraduate science majors. The importance of this project, present practice, and success factors for programs seeking excellence in the preparation of health sciences information professionals are reviewed. A needs assessment involving a national advisory panel and a follow-up study of individuals who have participated in previous specialized training programs in health sciences information, compared with a peer group of medical librarians who did not participate in such programs, is described. This paper presents the goals and objectives of the project, describes the methods used, and outlines a curriculum, continuing education initiatives, and recruitment activities.

Integration of information-seeking skills and activities into a problem-based curriculum.

Recent trends in medical education include a shift from the traditional, didactic, lecture-oriented approach to a more student-driven, problem-based approach to learning. This trend provides librarians with an opportunity to develop programs to teach information-gathering skills that support and are integrated into problem-based learning (PBL). In 1992, the University of Pittsburgh School of Medicine implemented the initial phase of a curriculum revision that emphasizes PBL. Since that time, Falk Library of the Health Sciences has provided a large-scale, intensive program integrating information-seeking skills and activities into the first-year Patient-Doctor Relationship course, a sequence that initiates medical school. A multimodal approach to information seeking and sources is emphasized, utilizing print and audiovisual materials, computerized resources, and subject experts. The Falk Library program emphasizes the gathering and use of information as central to both PBL and student skills development. An informal, post-course evaluation was conducted to gauge which information resources were used and valued most by students. This article presents evaluation results, including data on the use of information sources and services, and student perceptions of the librarian's role in the PBL sessions.