Si+
singly ionized silicon atom, 2P ground state
Species tag 028518
Version1*
Date of EntryAug. 2010
ContributorH. S. P. Müller

The frequency of the J = 1.5 – 0.5 line of singly ionized atomic silicon is from an astronomical observation by
(1) H. Feuchtgruber et. al., 1997, Astrophys. J. 487, 962.
The Einstein A value is from an ab initio calculation by
(2) C. Froese Fischer, 2002, unpublished;
cited in
(3) D. E. Kelleher and L. I. Podobedova, 2008, J. Phys. Chem. Ref. Data 37, 1235.

Lines Listed1
Frequency / GHz< 8611
Max. J2
log STR0-4.0
log STR1-4.0
Isotope Corr.-0.0352
Egy / cm–10.0
 µa / D 
 µb / D 
 µc / D 
 A / MHz 
 B / MHz 
 C / MHz 
 Q(1000.)4.6536
 Q(500.0)3.7604
 Q(300.0)3.0185
 Q(225.0)2.6456
 Q(150.0)2.2593
 Q(75.00)2.0168
 Q(37.50)2.0001
 Q(18.75)2.0000
 Q(9.375)2.0000
 Q(5.000)2.0000
 Q(2.725)2.0000
detected in ISM/CSMyes


Database maintained by Holger S. P. Müller and Sven Thorwirth, programming by D. Roth and F. Schloeder