NIST Technicalendar November 3 to November 7, 2008 The NIST Technicalendar is issued each Friday. All items MUST be submitted electronically from this web page by 12:00 NOON each Wednesday unless otherwise stated in the NIST Technicalendar. The address for online weekly editions of the NIST Technicalendar and NIST Administrative Calendar is: http://www.nist.gov/tcal/.

In this Issue: Meetings at NIST Meetings Elsewhere Announcements Talks by NIST Personnel NIST Web Site Announcements NIST Administrative Calendar (current)   NIST Vacancy Announcements (current)

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No Scheduled Events

No Scheduled Events

10:00 AM - Re-Envisioning Air Cleaning: Improving Indoor Air Quality Without Energy Consequences

10:00 AM - NIST to Receive "Citation for Chemical Breakthroughs" from the American Chemical Society Division of the History of Chemistry
10:30 AM - Pattern formation outside of thermodynamic equilibrium

10:30 AM - NIST/SAA Portrait Gallery Ceremony 2008
12:00 PM - High-Hydrogen Pressure Technique for Solid State Combinatorial Screening

11/3 -- MONDAY

No Scheduled Events

11/4 -- TUESDAY

No Scheduled Events

11/5 -- WEDNESDAY

10:00 AM - BUILDING ENVIRONMENT DIVISION SEMINAR: Re-Envisioning Air Cleaning: Improving Indoor Air Quality Without Energy Consequences
Jeffrey Siegel , Associate Professor, University of Texas.
226 Bldg, Rm. B221. (NIST Contact: Andrew Persily, 301-975-6418, andyp@nist.gov)


11/6 -- THURSDAY

10:00 AM - CHEMICAL SCIENCE AND TECHNOLOGY LABORATORY OFFICE SEMINAR: NIST to Receive "Citation for Chemical Breakthroughs" from the American Chemical Society Division of the History of Chemistry
NIST has been selected, along with Columbia University, to receive an American Chemical Society "Citation for Chemical Breakthrough" award in recognition of the isolation of the first isotope, deuterium as described in H. C. Urey, F. G. Brickwedde, G. M. Murphy, "A Hydrogen Isotope of Mass 2". Phys. Rev. 1932, 39, 164-165. This award program, administered by the ACS Division of the History of Chemistry, honors publications, patents and books that have made breakthroughs in chemistry and the molecular sciences that have been revolutionary in concept, broad in scope, and long-term in impact.
Jeffrey Seeman , ACS Division of the History of Chemistry. David Lide , NIST SAA.
Administration Bldg, Green Auditorium. (NIST Contact: Willie May, 301-975-8300, wem@Nist.gov)
Special Assistance Available

10:30 AM - CNST NANOFABRICATION RESEARCH GROUP SEMINAR: Pattern formation outside of thermodynamic equilibrium
The evolution of systems driven outside of thermodynamics equilibrium is characterized by strong nonlinearity and the formation of complex spatio-temporal patterns. We will give an overview of recent theoretical developments in this field, of the mathematical tools used in the description of these phenomena at the mesoscale, and of several applications in condensed matter physics, fluid mechanics, and materials science. In particular, we will describe recent research on self-assembly and defect motion in mesophases, with applications to microphase separation in block copolymers.
Jorge Vinals , Professor, McGill University, Montreal, Canada.,.
Bldg. 217, Rm. H107. (NIST Contact: James Liddle, 301-975-6050, james.liddle@nist.gov)


11/7 -- FRIDAY

10:30 AM - OFFICE OF THE DIRECTOR, NIST SEMINAR: NIST/SAA Portrait Gallery Ceremony 2008
NIST staff are invited to the Standards Alumni Association's 2008 Portrait Gallery Ceremony in the Red Auditorium on Friday, November 7, 2008, at 10:30 a.m. The ceremony will honor this year's inductees to the NIST Gallery of Distinguished Scientists, Engineers and Administrators: Donald R. Johnson, James E. Hill, Hratch G. Semerjian, Daniel T. Pierce, Kurt F. J. Heinrich, Robert F. Moore, Diana Nyyssonen, Richard E. Harris, Yong-Ki Kim, John M. Martinis. Friends and former colleagues are invited to join the honorees in a breakfast reception in the Employees Lounge starting at 9:30 a.m. Visitors should contact the Alumni office, 301-975-2486, or by email at alumni@nist.gov by noon on Wednesday November 5th to obtain a pass.
. . , ..
ADMIN Bldg, Red Auditorium. (NIST Contact: Anneke Sengers, 301-975-2463, johanna.sengers@nist.gov)
Special Assistance Available

12:00 PM - METALLURGY DIVISION SEMINAR: High-Hydrogen Pressure Technique for Solid State Combinatorial Screening
Ewa Ronnebro , Sandia National Laboratories, Livermore, CA.
Materials Bldg, Rm. B351. (NIST Contact: Leonid Bendersky, 301-975-6167, leonid.bendersky@nist.gov)


ADVANCE NOTICE

11/10/08 10:30 AM - CNST NANOFABRICATION RESEARCH GROUP: Time-resolved photoluminescence as a sensitive probe of charge separation in colloidal semiconducting nanocrystals
Electronic properties of nanomaterials such as colloidal CdSe nanocrystals (NCs) can be tailored by modifying their size and shape. This adaptability coupled with their ease of processability makes them very attractive materials for light-harvesting applications. Unfortunately the potential of NCs in photovoltaics have yet to be realized. This is due, in large part, to the complex electronic interactions of NC excitons with interfacial states and the surrounding environment, which can induce charge carrier dissociation into long-lived surface trap sites or external acceptor species. Unraveling the nature of these processes is a necessary step towards the creation of efficient NC-based solar cells, but progress in this field is significantly complicated by the inhomogeneous nature of NCs and by the involvement of states that are usually optically inactive. Time-resolved photoluminescence (PL) from CdSe nanocrystalline quantum dots reflects the radiative recombination rates from intrinsic exciton states and also contains information about non-radiative charge separation and recombination processes; however, interpretation of fluorescence transients is non-trivial and typical multi- or stretched exponential analyses yield little specific photophysical information. To address this problem, we have recently developed a method, based on classical Marcus electron transfer theory, whereby ensemble CdSe PL decays, measured over a wide temperature range, may be used to access pertinent information about the nature of charge separation processes in NCs. Using this method we are able to assess the influence of traps on the exciton population dynamics and, for the first time, quantitatively describe the transient PL of CdSe NCs in terms of well defined physical processes. These ideas can be extended to more complicated systems and I will discuss the potential for new PL-based techniques to probe carrier separation and recombination dynamics in multicomponent assemblies of NCs with molecules or other nanoscale systems.
Marcus Jones , Postdoc, University of Toronto, Department of Chemistry,.
Bldg. 217, Rm. H107. (NIST Contact: Nikolai Zhitenev, 301-975-6039, nikolai.zhitenev@nist.gov)

11/14/08 10:30 AM - NIST COLLOQUIUM SERIES: The Quest to Measure Longitude
Throughout the great ages of exploration and sail, from the end of the fifteenth century to the end of the eighteenth, navigators lost track of their longitude almost the moment they lost sight of land. Although they understood, in theory, how to assess their progress east or west, they owned no practical method for determining a ship's position at sea. Warfare and commerce were hamstrung by that lack, and governments offered princely sums to spur invention. Some of the greatest names in the history of science, including Galileo, Huygens, and Newton, worked on the longitude problem without success--until an unknown, self-educated clockmaker from the north of England offered his singularly accurate timekeeper as the unlikely solution. Dava Sobel is an award winning author. Her best-selling books, Longitude and Galileo's Daughter, will be available for review and purchase before and after the lecture.
Dava Sobel , Science Journalist and Author.
Administration Building, Green Auditorium. (NIST Contact: Kum Ham, 301-975-4203, kham@nist.gov)
Special Assistance Available

11/25/08 10:30 AM - CNST NANOFABRICATION RESEARCH GROUP SEMINAR: Broadband Optoelectronic Characterization of Individual Semiconducting Single-Walled Carbon Nanotubes
While single-walled carbon nanotubes (SWNTs) have shown tremendous potential for electronic and energy applications, a comprehensive understanding of their electronic structure is still lacking. One crucial limitation has been the availability of broadband optical data on structurally characterized SWNTs, due in large part to the specificity of experimental techniques to a limited spectral range and subset of diameters as well as the inaccessibility of the lowest energy optical transitions (spanning the near and mid infrared) in large diameter semiconducting SWNTs. In order to address this challenge, we have developed rapid, broadband, and high-resolution spectroscopic techniques for studying both the visible and infrared electronic states on an individual SWNT. We have accomplished this using a process which combines observation of resonant enhancement in the spectra of elastic scattered supercontinuum laser light with an infrared Fourier transform photoconductivity methodology. We present our determination of the optical response over the range of 0.3 to 2.7 eV from a set of SWNTs and examine the scaling of the optical features as a function of diameter and subband index. In contrast to traditional bulk inorganic materials, we find that optical excitation in these 1D nanostructures results in moderately bound excitons under ambient conditions. As a result, the ultimate utility of these materials in energy applications, either directly or as composite materials, depends on the rapid and efficient dissociation of the excitonic state. Using results from our infrared photoconductivity measurement, we will discuss the challenges in determining the mechanisms and potential efficiencies for exciton dissociation and collection in these and other 1D materials.
Matthew Sfeir , Brookhaven National Lab.
Bldg. 217, Rm. H107. (NIST Contact: Nikolai Zhitenev, 301-975-6039, nikolai.zhitenev@nist.gov)

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MEETINGS ELSEWHERE


11/3 -- MONDAY

11:00 AM - CARNEGIE INSTITUTION OF WASHINGTON/GEOPHYSICAL LAB. SEMINAR: CHARGE ORDERING AS ALTERNATIVE TO JAHN-TELLER DISTORTION
I Mazin , NRL.
Bldg, Rm..
Greenewalt Bldg., GL-DTM Grounds, Carnegie Institution of Washington, DC. (NIST Contact: R. Cohen, 202-478-8900, seminar@lists.ciw.edu)



11/4 -- TUESDAY

No Scheduled Events

11/5 -- WEDNESDAY

No Scheduled Events

11/6 -- THURSDAY

No Scheduled Events

11/7 -- FRIDAY

No Scheduled Events

ADVANCE NOTICE

No Scheduled Events

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TALKS BY NIST PERSONNEL

CLARK, C. : RELATIVITY AT A BILLIONTH OF THE SPEED OF LIGHT.
Stanford Photonics Research Center, Stanford University, Stanford, CA, 11/6.

CLARK, C. : MATTER WAVE MAGIC.
Physics Colloquium, Western Washington University, Bellingham, WA, 11/7.

WU, W. : APPLICATON OF X-RAY FOR NANOSTRUCTURE CHARACTERIZATION.
Ritsumeikan University, Kusatsu, Japan, 11/7.

BECKER, M. : NON-TRADITIONAL METHODS FOR CHARACTERIZING BIOMATERIAL INTERFACES.
Nagoya University, Nagoya, JAPAN, 11/7.

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ANNOUNCEMENTS

WANTED: MUSEUM TOUR GUIDES
Calling All History Buffs! Do you have knowledge of, and interest in, NIST history? Would you like to learn more and share that knowledge with others? The NIST Museum is seeking volunteer museum tour guides. Guides are needed to provide museum tours, on an as-needed basis, to international visitors, conference attendees, student groups, and others who visit the museum. A training session for guides will be held in November. Please contact Keith Martin (x2789, keith.martin@nist.gov) if you are interested.
NIST Contact: Keith Martin, 301-975-2789, kmartin@nist.gov

HOW CAN YOUR LAB LIAISON HELP YOU?
Watch this new video podcast and learn what NIST Labs are saying about ISD's Lab Liaisons. (4+ minutes) http://nvl-i.nist.gov/index.cfm?videos/ISD_liaisons/
NIST Contact: Information Desk, 301-975-3052, library@nist.gov

INTERACTIVE LIBRARY AND PUBLISHING NEWS
We've revamped our library and publishing newsletter to include *your thoughts, *your ideas. We're taking our news and your comments to a new interactive level where we'll be conversing and exchanging information. ISD NewsCenter will release new articles or announcements twice a week. We hope you'll bookmark the site and return to it frequently or sign up to receive alerts. http://nvl-i.nist.gov/index.cfm?isdnewscenter/
NIST Contact: Nancy Allmang, 301-975-4189, nancy.allmang@nist.gov

VISITOR REGISTRATION FOR NIST EVENTS
Because of heightened security at the NIST Gaithersburg site, members of the public who wish to attend meetings, seminars, lectures, etc. must first register in advance. For more information please call or e-mail the "NIST Contact" for the particular event you would like to attend.
NIST Contact: . ., ., .

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NIST WEB SITE ANNOUNCEMENTS

No Web Site announcements this week.

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For more information, contact Ms. Sharon Hallman, Editor, Stop 2500, National Institute of Standards and Technology, Gaithersburg MD 20899-2500; Telephone: 301-975-TCAL (3570); Fax: 301-926-4431; or Email: tcal@nist.gov.

All lectures and meetings are open unless otherwise stated.

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