Navigation Links
New NIST nano-ruler sets some very small marks
Date:9/22/2009

The National Institute of Standards and Technology (NIST) has issued a new ruler, and even for an organization that routinely deals in superlatives, it sets some records. Designed to be the most accurate commercially available "meter stick" for the nano world, the new measuring toola calibration standard for X-ray diffractionboasts uncertainties below a femtometer. That's 0.000 000 000 000 001 meter, or roughly the size of a neutron.

The new ruler is in the form of a thin, multilayer silicon chip 25 millimeters square (just under an inch). Each one is individually measured and certified by NIST for the spacing and angles of the crystal planes of silicon atoms in the base crystal.

X-ray diffraction works by sending X-rays through a crystalwhich could be anything from a wafer used to make microchips to a crystallized sample of an unknown proteinand observing the patterns made by the X-rays as they diffract from electrons in the crystal. The spacing, angles and intensity of the pattern's lines tell a trained crystallographer the relative positions of the atoms in the crystal, as well as something about the quality of the crystal, the nature of the chemical bonds and more. It is one of the workhorse techniques of materials science and engineering. The precision version, high-resolution X-ray diffraction, can be used to determine the thickness, crystal structure, embedded strain and orientation of thin films used in advanced semiconductor devices and nanotechnologies.

Formally NIST Standard Reference Material (SRM) 2000, "Calibration Standard for High-Resolution X-Ray Diffraction," the new ruler gives crystallographers an extremely well-known crystal sample for calibrating their precision instruments. It was made possible by the development of a unique parallel beam diffractometer at NIST that makes measurements traceable to international measurement standards and is believed to be the most accurate angle measuring device of its kind in the world. The NIST instrument can measure angles with an accuracy better than an arc second, 1/3600 of a degree. "Our accuracy is at about the angle made by the diameter of a quarterif you're looking at it from two miles away," explains NIST materials scientist Donald Windover, "The precision is better, about the size of Washington's nose."

Because the crystal lattice values for SRM 2000spacing, tilt, orientationare traceable to SI units, the new material provides an absolute reference for high-precision calibrations. Details are available at https://www-s.nist.gov/srmors/view_detail.cfm?srm=2000.


'/>"/>

Contact: Michael Baum
michael.baum@nist.gov
301-975-2763
National Institute of Standards and Technology (NIST)
Source:Eurekalert

Related biology technology :

1. Poniard Pharmaceuticals Announces Pivotal Phase 3 SPEAR Trial Evaluating Picoplatin in Small Cell Lung Cancer Reaches 320th Event Target
2. Reportlinker Adds Small Molecule Kinase Inhibitors Report
3. BioSpecifics Technologies Corp. to Present at CapStone Investments Third Annual Small-Cap Investor Conference
4. Global Small Molecule Kinase Inhibitors Market to Reach $16.2 Billion by 2015, According to a New Report by Global Industry Analysts, Inc.
5. Debiopharm Group and Moffitt Cancer Center Sign Development and Commercialisation Agreement for Small Molecule Debio 0928 in Early Preclinical Development for Treatment of Solid Tumours
6. The Worlds Smallest Hero! Rexin-G, Targeted Therapy for Metastatic Cancers
7. AEterna Zentaris Discloses Preliminary Phase 2 Trial Results for Perifosine in Combination with Radiotherapy for Non-Small Cell Lung Cancer
8. Signostics Receives FDA Clearance for Worlds Smallest Ultrasound Product
9. PTC Therapeutics and Spinal Muscular Atrophy Foundation Announce $8.5 Million Small Molecule Development Collaboration
10. Big prize for small science physicist
11. Aegera Initiates Phase 2 Clinical Trial Of AEG33773 - A Small Molecule Targeting Neuropathic Pain
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/26/2016)... YORK , May 26, 2016 ... today that it will be a featured presenter at the ... in New York City at the ... Denis Corin , Q BioMed Inc. CEO, is scheduled to ... will cover the company,s business strategy, recent developments and outline ...
(Date:5/26/2016)... ... May 26, 2016 , ... ... today announced several positive developments that position the Company for the future. ... the transaction, Craig F. Kinghorn has been appointed Chairman of the Board, Curtis ...
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... ... of a Thai delegation at BIO 2016 in San Francisco. Located at booth ... will be available to answer questions and discuss the Thai biotechnology and life ...
(Date:5/25/2016)... Bethesda, Md. (PRWEB) , ... May 25, 2016 ... ... a request for information (RFI) issued by the Office of the National Coordinator ... the patient experience, and determines if clinically relevant data were available when and ...
Breaking Biology Technology:
(Date:4/28/2016)... and BANGALORE, India , April ... EdgeVerve Systems, a product subsidiary of Infosys (NYSE: ... today announced a global partnership that will provide ... to use mobile banking and payment services.      ... a key innovation area for financial services, but it also ...
(Date:4/26/2016)... and LONDON , ... Finacle, part of EdgeVerve Systems, a product subsidiary ... Onegini today announced a partnership to integrate the ...      (Logo: http://photos.prnewswire.com/prnh/20151104/283829LOGO ) ... provide their customers enhanced security to access and ...
(Date:4/19/2016)... 20, 2016 The new GEZE ... compact web-based "all-in-one" system solution for all door components. ... or the door interface with integration authorization management system, ... systems. The minimal dimensions of the access control and ... building installations offer considerable freedom of design with regard ...
Breaking Biology News(10 mins):