Photoionization-of-[CO.sub.2] database available online. (General Developments).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 available on the Web a database containing photoionization Photoionization The ejection of one or more electrons from an atom, molecule, or positive ion following the absorption of one or more photons. The process of electron ejection from matter following the absorption of electromagnetic radiation has been under efficiency, vibrational branching ratios, and asymmetry parameters in the photoionization of [CO.sub.2] in the region between 65 nm and 84 nm. The study of [CO.sub.2] photoionization historically has attracted much attention due to the importance of the ionization ionization: see ion. ionization Process by which electrically neutral atoms or molecules are converted to electrically charged atoms or molecules (ions) by the removal or addition of negatively charged electrons. of [CO.sub.2] in the photophysics of planetary atmospheres, including Earths atmosphere. Additionally, [CO.sub.2] is an integral part of the carbon cycle for plant life and, as a consequence, the photochemistry photochemistry, study of chemical processes that are accompanied by or catalyzed by the emission or absorption of visible light or ultraviolet radiation. A molecule in its ground (unexcited) state can absorb a quantum of light energy, or photon, and go to a and photophysics of this molecule has been the subject of considerable interest by a number of scientists over the last several decades. This work was motivated because [CO.sub.2] is a prototype molecular system for complex quantum-mechanical configuration mixing of bound, excited states and states in the ionization continuum. These interactions produce distinct resonances in both energy and angle. This data set is the most complete available anywhere for information on the ionization of [CO.sub.2] in the wavelength region within 10 eV of ionization onset. The high resolution of these data resolve individual molecular vibrational states. The graphical user interface graphical user interface (GUI) Computer display format that allows the user to select commands, call up files, start programs, and do other routine tasks by using a mouse to point to pictorial symbols (icons) or lists of menu choices on the screen as opposed to having to designed for the database includes options to retrieve any subset of the data in several different formats, including graphical output (with or without errors bars displayed), HTML table An HTML structure for creating rows and columns. It is used for lists, specifications and other tabular data as well as to locate elements on the page. The table command gives the HTML designer reasonably precise control over placement of text and images. output (which is fully accessible according to the Section 508 accessibility requirements), and ASCII text output (which is useful for copying and pasting into other applications). CONTACT: Albert Parr, (301) 975-2316; albert.parr@nist.gov or Robert Dragoset, (301) 975-3718; robert.dragoset@nist.gov. |
|
||||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion