J/AZh/79/932 On the atomic constants of TaI (Smirnov, 2002) ================================================================================ On the atomic constants of TaI. Smirnov Yu.M. =2002AZh....79..932S =2002ARep...46..840S ================================================================================ ADC_Keywords: Atomic physics Abstract: Cross sections for the excitation of transitions in the tantalum atom (Z=73) not related to the ground state have been measured using extended crossed beams and optical spectroscopy. The total excitation cross sections for 23 energy levels of TaI have been determined. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations ------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 98 77 Excitation cross sections for spectral lines of the tantalum atom table2.dat 48 46 Total excitation cross sections of the energy levels of the tantalum atom -------------------------------------------------------------------------------- Byte-by-byte Description of files: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 F7.3 0.1nm Lambda Spectral line wavelength 10- 42 A33 --- Trans Type of transition 45- 52 A8 --- J Inner quantum number 54- 58 I5 cm-1 Elow Energy of lower level 61- 65 I5 cm-1 Eup Energy of upper level 66 A1 --- Rem [*] Marks two nearby levels for which common cross section is given in column Q50 68- 72 F5.1 10-18cm+2 Q50 ? Cross section for an electron energy of 50eV 75- 79 F5.1 10-18cm+2 Qmax ? Cross section at the maximum of the optical excitation functions 82- 83 I2 eV EQmax ? Energy for Qmax 86 I1 --- OEF [1-4]? Curve number of the optical excitation function (1) 90- 96 F7.3 --- Ilam/gA ? Ratio of I*lam to g*A (2) -------------------------------------------------------------------------------- Note (1): There are four optical excitation functions, the curve number corresponds to the position of the maximum EQmax. See Fig. 1 of the paper. Note (2): Ratio of I*lam to g*A, where I is the line intensity, lam is the line wavelength, g is the statistical weight of upper level and A is the transition probability Ilam/gA should be the same for each set of lines with a common upper level. -------------------------------------------------------------------------------- Byte-by-byte Description of files: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 F8.3 0.1nm Lambda Spectral line wavelength 11- 15 I5 cm-1 Eup ? Energy of upper level 18- 22 F5.1 10-18cm+2 Q50 ? Cross section for an electron energy of 50eV 25- 29 A5 --- BR ? Branching ratio from Den Hartog et al., 1987, J. Opt. Soc. Am. B 4, 48 32- 36 F5.1 10-18cm+2 IntQ50 ? Total excitation cross section of TaI energy level for an exciting-electron energy of 50eV -------------------------------------------------------------------------------- ================================================================================ (End) Veta Avedisova (INASAN) 04-May-2003