Handbook of basic atomic spectroscopic data available online.NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. has made a handbook of basic atomic spectroscopic spec·tro·scope n. An instrument for producing and observing spectra. spec  tro·scop information available at physics.nist.gov/ Handbook. The handbook is designed to provide a selection of the most important and frequently used atomic spectroscopic data in an easily accessible format. The compilation includes data for the neutral and singly ionized i·on·ize tr. & intr.v. i·on·ized, i·on·iz·ing, i·on·iz·es To convert or be converted totally or partially into ions. i atoms of all elements hydrogen through einsteinium einsteinium (īn`stī'nēəm, īnstī`–) [for Albert Einstein], artificially produced radioactive chemical element; symbol Es; at. no. 99; mass no. of most stable isotope 252; m.p. about 860°C;; b.p. and sp. gr. (1 through 99). The wavelengths, intensities, and spectrum assignments are given in a table for each element, and the data for the approximately 12 000 lines of all elements also are collected into a single table, sorted by wavelength (a "finding list"). For the strongest and most persistent lines of each spectrum, the complete energy-level classifications are provided as are the transition probabilities, if available. Linked data files make finding, identifying, and determining additional information about included transitions very quick and easy. Although the data for some spectra are not as complete as those found in NIST's Atomic Spectra Database (physics.nist.gov/ asd), this compilation includes more recent data for many elements, particularly the heavier ones. The atomic number atomic number, often represented by the symbol Z, the number of protons in the nucleus of an atom, as well as the number of electrons in the neutral atom. Atoms with the same atomic number make up a chemical element. and weight are listed for each element, as well as the naturally occurring isotopes and their isotopic mass, abundance, nuclear spin, and magnetic moment. The ground state and the ionization potential for the first and second spectra are given. The handbook also is packaged as zipped HTML HTML in full HyperText Markup Language Markup language derived from SGML that is used to prepare hypertext documents. Relatively easy for nonprogrammers to master, HTML is the language used for documents on the World Wide Web. files suitable for downloading to electronic books. Directions for downloading are included on the Web site. CONTACT: Jean Sansonetti, (301) 975-4725; jean. sansonetti@nist.gov or William Martin, (301) 975-3213; william.martin@nist.gov. |
|
||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion