VALD Team internal pages
VALD-3 binary record format
Total record length: 270 bytes
Field short name |
Type |
Unit |
Default |
Description |
wl |
real*8 |
Å |
|
wavelength in vacuum |
species |
int*4 |
|
|
VALD species code, see VALD list of species |
loggf |
real*4 |
|
|
log statistical weight times oscillator strength |
e_low |
real*8 |
cm^-1 |
|
energy of the lower level |
j_low |
real*4 |
|
|
orbital quantum number for the lower level |
e_upp |
real*8 |
cm^-1 |
|
energy of the upper level |
j_upp |
real*4 |
|
|
orbital quantum number for the upper level |
lande_low |
real*4 |
|
99 |
Lande factor for the lower level |
lande_upp |
real*4 |
|
99 |
Lande factor for the upper level |
gamrad |
real*4 |
s^-1 |
0 |
log Radiative damping constant |
gamst |
real*4 |
(s*Ne)^-1 |
0 |
log Quadratic Stark damping constant at l0000 K (where Ne is the electron number density) |
gamvw |
real*4 |
depends on value |
0 |
van der Waals damping parameter: if <0: log gamma_6 in units of (s*NH)^-1 at l0000 K (where NH is the number density of neutral hydrogen); if >0 : two parameters as defined in Barklem et al. 2000A&AS..142..467B : integer part is cross-section sigma, fractional part is velocity parameter alpha |
term_flag_low |
char*2 |
|
blank |
level coupling type (e.g. LS) |
char*86 |
|
blank |
lower level term designation |
|
term_flag_upp |
char*2 |
|
blank |
level coupling type (e.g. LS) |
char*86 |
|
blank |
upper level term designation |
|
source |
char*7 |
|
blank |
reference to the oscillator strength source |
accuracy_flag |
char*1 |
|
blank |
type of the accuracy value (see below) |
accuracy |
char*6 |
|
blank |
accuracy of the oscillator strength |
Transition type |
char*1 |
|
blank |
Allowed transition |
|
|
|
A |
Autoionizing transition |
|
|
|
B |
Forbidden: Electric quadrupole transition (E2) |
|
|
|
C |
Forbidden: Magnetic dipole transition (M1) |
|
|
|
D |
Forbidden: Magnetic quadrupole transition (M2) |
|
|
|
E |
Forbidden: Electric octupole transition (E3) |
|
|
|
F |
Forbidden: Magnetic octupole transition (M3) |
Extra information |
char*1 |
|
blank or 0 |
No extended information |
|
|
|
1 |
Extended van der Waals |
|
|
|
2 |
Extended Stark |
|
|
|
3 |
Extended van der Waals & Stark |
|
|
|
4 |
Transition has hfs extension |
|
|
|
5 |
Extended van der Waals & hfs |
|
|
|
6 |
Extended Stark & hfs |
|
|
|
7 |
Extended van der Waals & Stark + hfs |
Not assigned |
char*1 |
|
blank |
Not used |
Not assigned |
char*1 |
|
blank |
Not used |
comment |
char*16 |
|
blank |
additional comments (e.g. wavelength accuracy) |
Notes:
Fields without Default value are mandatory.
accuracy_flag values:
' ' or '_' ... no value
'N' ... quality class (NIST)
- An estimated accuracy is listed for each transition strength, indicated by a code letter as given in the table below:
AAA ≤ 0.3%
AA ≤ 1%
A+ ≤ 2%
A ≤ 3%
B+ ≤ 7%
B ≤ 10%
C+ ≤ 18%
C ≤ 25%
D+ ≤ 40%
D ≤ 50%
E > 50%.
'E' ... absolute error in dex
'C' ... cancellation factor
Cancellation factor (CF) is defined as follows. Calculations of the line transition probability are made by summation of contributions of eigenvector components of wave functions of the lower and upper states that come with different signs. All positive and negative contributions are summed separately in partial sums S+ and S−, so that the line strength is given by S = (S+) + (S−). Then CF is defined as CF = [(S+) − abs(S−)]/[(S+) + abs(S−)]. Thus, CF ends up in the range between [−1, 1], and “strong cancellation” occurs when |CF| is close to zero.
'P' ... predicted line