J/A+AS/97/443 Fluorescence for Be to Zn (Kaastra+ 1993) ================================================================================ X-ray emission from thin plasmas. I. Multiple Auger ionisation and fluorescence processes for Be to Zn. Kaastra J.S., Mewe R. =1993A&AS...97..443K ================================================================================ ADC_Keywords: Atomic physics Keywords: atomic data Abstract: The basic physical processes responsible for X-ray emission from thin plasmas are considered. Collisional ionization or photoionization of inner shells of neutral atoms and ions leads to the creation of a vacancy in one of the inner shells of the ion or atom, which is filled by a cascade of radiative (fluorescent) and nonradiative (Auger) transitions. The net result is the ejection of several electrons and photons, leaving the atom in a multiply ionized state. In this paper, the distribution of the number of emitted photons and electrons after the creation of a hole in an inner shell of an atom or ion is calculated for all ions from H to Zn. The method consists of two stages: the calculation of transition rates for a given electron configuration, and calculation of probabilities of the several cascade sequences using these transition rates. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2 76 1090 Electron distribution table3 30 11732 Fluorescence yields -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Z Atomic number 3- 5 I3 --- st Ionisation stage of ion BEFORE ionisation (neutral=1 etc.) 6- 7 I2 --- s Shell number of primary vacancy (1-7 correspond to K L1 L2 L3 M1 M2 M3) 8- 14 F7.1 eV I Ionisation energy of the primary vacancy in eV (from Lotz) 15- 21 F7.1 eV EA Energy that goes into Auger electrons, in eV 22- 25 I4 10-3 epsilon Correction factor defined in equation 6 of the paper 27- 31 I5 10-4 PrEj1 Probability that a photo-ionisation leads to ejection of 1 electron (1) 32- 36 I5 10-4 PrEj2 Probability of 2 electrons photoionisation (1) 37- 41 I5 10-4 PrEj3 Probability of 2 electrons photoionisation (1) 42- 46 I5 10-4 PrEj4 Probability of 2 electrons photoionisation (1) 47- 51 I5 10-4 PrEj5 Probability of 2 electrons photoionisation (1) 52- 56 I5 10-4 PrEj6 Probability of 2 electrons photoionisation (1) 57- 61 I5 10-4 PrEj7 Probability of 2 electrons photoionisation (1) 62- 66 I5 10-4 PrEj8 Probability of 2 electrons photoionisation (1) 67- 71 I5 10-4 PrEj9 Probability of 2 electrons photoionisation (1) 72- 76 I5 10-4 PrEj10 Probability of 2 electrons photoionisation (1) -------------------------------------------------------------------------------- Note (1): NOTE that the probabilities have been multiplied by 10000. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- Z Atomic number 4- 6 I3 --- st Ionisation stage of ion BEFORE ionisation (neutral=1 etc.) 7- 9 I3 --- s Shell number of primary vacancy (1-7 correspond to K L1 L2 L3 M1 M2 M3) 10- 12 I3 --- Delta Number of Auger electrons ejected before emission of the line; the line therefore occurs in the ion with ionisation stage st+Delta+1 (the factor 1 corresponds to the photo-electron) 13- 15 I3 --- il Line identification number; labels according to table 1 of the paper. Note that il runs from 1 to 22. 16- 23 F8.1 eV E Approximate line energy of the transition; note that often more accurate energies can be found in the literature. 24- 30 F7.4 --- omega The fluorescence yield omega for this line (number of photons emitted per primary vacancy) -------------------------------------------------------------------------------- ================================================================================ (End) Francois Ochsenbein [CDS] 13-Apr-1993