This README.TXT file contains some comments and a list of the files in the directory collision_data with a short description of each file. AS OF 03/19/02 THIS SITE HAS BEEN EXTENSIVELY REVISED. IF YOU HAVE PROBLEMS OR QUESTIONS CONTACT ME AT avp@jila.colorado.edu The *.TXT files are tabulations of collision data in ASCII format and can be read with most editors that will handel a 120 column width. One should remove the ";n" (VAX version number -n) from all downloaded file names before using the files. The *.NB files are Mathematica 4.0 Notebook files that are our calculations leading to cross sections for He-He, various CH4 ion and neutral fragments, etc. The He-He collision results are summarized in the file ATOMATOM.TXT. The *.nb files can be read with Mathematica 4.0 or with Mathematica Reader. Mathematica Reader was (is?) available for "free" (actually for your telephone number, email address, etc.) at http://www.wolfram.com/mathreader/. The heavy particle collision files only partially reproduce the data in my J. Phys. Chem. Ref. Data series. I have put only a portion of the data in a format that is different from that used in the J. Phys. Chem. Ref. Data papers as required by the ACS. Also, I have not completed an update of the hydrogen heavy particle data for H+ and H2+ collisions with H2. My recent revision of suggested H3+ + H2 data is cited below. Note that in filenames the word ATOM often includes molecules. My hope is that the unpublished portions of this site will be treated as a "public private communication". To me, this means that the reader is free to ignore this material, i.e., pretend it does not exist. If the reader makes use of the material in a publication, the material should be treated as a private communication with a citation such as "A. V. Phelps, (private communication) or (unpublished) ftp://jila.colorado.edu/collision_data/". Please do not refer to this material as "JILA data", etc. as When you find errors in these files or have suggestions, please contact me at avp@jila.colorado.edu. ---------------------------------------------------------- Directory and File descriptions: Main directory: COLLISION_DATA Subdirectory CATHODEFALLDATA: These unpublished files contain experimental data collected from the references cited on the operating characteristics of cathode dominated discharges. In some cases the data has been partially analyzed to give normalized current densities, normalized electrode spacings, etc. Includes the files ARCATHVI.QPW, GUNTHER1.QPW, H2CATHVI.QPW, HECATHVI.QPW, HGCATHVI.QPW, KRCATHVI.QPW, N2CATHVI.QPW, NECATHVI.QPW, O2CATHVI.QPW, and XECATHVI.QPW. These files are tabulations of published experimental voltage, current, and cathode-fall thickness data for Ar, H2, He, Hg, Kr, N2, Ne, O2, and Xe. There is also a file with some of Guntherschulze's data. Most of this data was assembled about 1990, but the compilation has not appeared in print. A review paper utilizing some of this data for Ar has been published by Phelps, Plasma Sources Science and Technology 10, 329 (2001). The files are in QuatroPro 9 format. Subdirectory NEUTRALNEUTRAL: This directory includes: ATOMATOM.TXT: Collision cross sections for Ar-Ar and N2-N2 based on Phelps, J. Phys. Chem. Ref. Data articles. Theoretical collision cross sections for the elastic scattering of the rare gas atom pairs He-He, Ne-Ne, Ar-Ar, Kr-Kr, Xe-Xe, Ne-Xe, Ne-Ar, and He-Ar for collision energies from 0.1 eV to 10 keV. Except for the Ar-Ar results, this work is unpublished. The high energy portion of the He-He data is currently being revised to take into account inelastic collisions. ATOMATOMGEC00.PPT: Posters presented at GEC2000 in POWERPOINT 97 format on atom-atom collisions. Includes some material in the file ATOMATOM.TXT. H2H3PQDATA.DOC and H2H3PQDATA.NB: These files present a revision of our JPCRD review of H3+ +H2 cross sections in two different formats, i.e., MSWord and Mathematica 4.0. Unpublished, but some material is cited by Bogaerts et al (submitted) (2001). HXPARQDATA.DOC: A translation of a portion of a Mathematica Notebook containing a revision of our 1992 JPCRD review of collisions of various hydrogen ions and atoms with Ar. Subdirectory ELECTRONNEUTRAL: This directory includes: ELECTRON.TXT: Collision cross sections for electrons with H2, N2, O2, CO2, H2O, NO, SF6, He, Ne, Ar, Kr, Xe, Mg, and Na. These are all of the electron cross sections assembled by Phelps and coworkers for use with the Boltzmann code BACKPRO. Comments on more recent work are added. ELETRANS.TXT: Transport and reaction coefficients for electrons in Ar, H2, N2, O2, and dry air calculated using the cross sections in ELECTRON.TXT. HAYASHI.TXT: Cross sections for electon collisions with 25 levels of Ar. This set was generated by M. Hayashi (unpublished) and has been tested against swarm results by S. Kondo and K. Nanbu, Vacuum 47, 1031 (1996). Subdirectory IONNEUTRAL: This directory includes: IONATOM.TXT: Collision cross sections for Ar+ - Ar, N+ - N2, N2+ -N2, He+ -He, He+ -Ar, Ar+ -He, Na+ -Xe, Xe+ -Xe, Ne+ -Xe, Xe+ - Ne, and Ne+ -Ne. The He+ -He, He+ -Ar, Ne+ -Ne, Na+ - Xe, Xe+ -Xe, Ne+ -Xe, Xe+ -Ne, and Ar+ -He data are unpublished. IONATOMGEC01.PPT: Poster presented at GEC2001 in POWERPOINT 97 format on asymmetric ion-atom collisions, including some of those in the file IONATOM.TXT. This poster paper is also provided as GEC01IONATOM.DOC. Unpublished. SYMMIONSICPEAC.PPT: Poster presented at ICPEAC2001 in POWERPOINT 97 format on symmetric ion-atom collisions, including some of those in the file IONATOM.TXT. This poster paper is also provided as ICPEACSymmIonQs.DOC. Unpublished. IONTRANS.TXT: Transport and reaction coefficients for N+ and N2+ in N2, He+ in He, Ne+ in Ne, and Ar+ in Ar. Unpublished. Subdirectory ATTACHMENT-DETACHMENT: The Mathematica 4.0 file Attachment-Detachment.nb contain the beginnings of a review of the literature and an analysis of the data on electron attachment and detachment in air at E/N near breakdown. The graphics files *.OPJ are in Origin 6.0 format. Unpublished. Subdirectory HEHENOTES: These Mathematica notebooks have been revised, but may need further revision to take into account better the theoretical results in the file ATOMATOM.TXT. Also, the results presented here are subject to change as I learn more about the literature and find mistakes. If you find mistakes here or elsewhere, please let me know. Unpublished. HEDIFFQ.NB: Discussion of the details of He-He differential cross sections. HEHETHERMAL.NB: Concerned mostly with fitting the temperature dependent viscosity, thermal conductivity, and diffusion coefficient data for He in He. HEHEAVERAGES.NB: Averaging He+ - He and He - He cross sections for ionization and excitation over a 1-D Maxwellian and the fitting of these results with analytic expressions versus KTion and E/n. Subdirectory METHANENOTEBOOKS: These Mathematica notebooks contain unpublished compilations of cross sections and calculations of ion, fast-neutral, and photon fluxes for comaprison with the experiments of Petrovic and Phelps. Unpublished. Subdirectory NDVCR: This Mathematica notebook, etc. contains an unpublished model of the negative-differential-voltage-current ratio observed in very low-current, low-pressure discharges in Ar. Unpublished. Subdirectory NITROGEN: N2MODCSCRL.NB: Unpublished analytical differential cross sections for electron-N2 collisions. Based in the set of differential cross sections derived in Phelps and Pitchford, Phys. Rev. A 31, 2932 (1985). This technique was later extended to rare-gas, atom-atom collisions. Subdirectory TEMPORARY: Contains various files being made available temporarily on request. This may be empty. README.TXT: The present file. File revised: 03/31/02