New Ritz Wavelengths And Transition Probabilities Of Parity-Forbidden [Mn Ii] Lines Of Astrophysical Interest

We report a comprehensive list of accurate Ritz wavelengths and calculated transition probabilities for parity-forbidden [Mn ii] lines. Ritz wavelengths have been derived from experimentally established energy level values resulting from an extensive analysis of a high-resolution Fourier-transform emission spectrum of singly ionized manganese. Our analysis includes transitions between all known metastable and other long-lived levels of Mn ii giving a total of 1130 [Mn ii] Ritz wavelengths. Our entire list of derived Ritz wavelengths for [Mn ii] lines ranges between 237 nm and 170 mu m (42,125-58 cm(-1)). The accurate Ritz wavelengths and calculated transition probabilities for forbidden lines in this paper are useful in the study and diagnostics of nebulae and other low-density astrophysical plasmas.