Friends,

I found a basis set for Iodine atom from Q-Chem sample example $QC/samples/ecp/cis_ext.charges_I.in. This gives good results for the electronic structure calculations of my system (containing Iodine). Normally for I, ECPs with 28 and 46 core electrons are available(Stutgart ECP or EMSL). But this basis set uses ECP for 36 core electrons.
Does anyone know what is the source of this basis set ? Which references should I mention if I want to cite this basis ? The basis set is -


$ecp
I 0
I-ECP 3 36
F POTENTIAL
4
2 2.00659990 -2.60678697
2 5.41200018 -15.30154037
2 20.88789940 -73.32185364
1 63.82109833 -23.43061638
S-F POTENTIAL
6
2 1.53009999 -144.29801941
2 1.85660005 252.49822998
2 2.58430004 -200.15640259
2 3.75419998 85.98131561
1 1.13870001 32.24239349
0 12.47010040 6.45168209
P-F POTENTIAL
6
2 0.91109997 32.43734360
2 1.06579995 -101.57602692
2 1.38989997 169.25859070
2 1.79579997 -105.27653503
1 2.54789996 12.12060356
0 1.17250001 6.45733500
D-F POTENTIAL
6
2 0.86530000 3.41730189
2 0.89960003 -3.97894001
2 4.58720016 -37.31042862
2 5.52820015 77.44996643
1 22.20800018 18.01509857
0 19.14010048 6.86909294
****
$end


$basis
I 0
S 1 1.00
0.6803000 1.00000000
S 1 1.00
0.5208000 1.00000000
S 1 1.00
0.1143000 1.00000000
P 1 1.00
1.1250000 1.00000000
P 1 1.00
0.3508000 1.00000000
P 1 1.00
0.1166000 1.00000000
D 1 1.00
3.9502000 1.00000000
D 1 1.00
2.5742000 1.00000000
D 1 1.00
1.3071000 1.00000000
D 1 1.00
0.5116000 1.00000000
D 1 1.00
0.2660000 1.00000000
SP 1 1.00
0.08000 1.00000000 1.00000000
SP 1 1.00
0.03680 1.00000000 1.00000000
SP 1 1.00
0.007360 1.00000000 1.00000000
SP 1 1.00
0.001470 1.00000000 1.00000000
SP 1 1.00
0.000294 1.00000000 1.00000000
SP 1 1.00
0.0000588 1.00000000 1.00000000
SP 1 1.00
0.0000118 1.00000000 1.00000000
SP 1 1.00
0.00000235 1.00000000 1.00000000
****
$end


Thanks.