1. LIF Spectroscopy of Jet Cooled MgOH
Masaru Fukushima and Takashi Ishiwata
Graduate School of Information Sciences, Hiroshima City University,
Hiroshima , Japan

2. Metal-Bearing Free Radicals
Metal : Mg, Al, Si ( the 3rd periodic elements )
Ligand : OH, SH, CN/NC, C2, CO, …
Astrophysical interests
One of the candidates of the unidentified lines from interstellar clouds.
Molecular dynamical interests
Relatively low isomerization potential barrier was predicted.
T. Kinoshita and T. Hirano, 17th Austin Symposium, 1998.

3. MgOH/MgOD 1986 Y. Ni and D. O. Harris LIF spectrum in furnace
1992 Barclay Jr. et al.
Rotational spectrum in furnace
( and the other MW works )
1995 Bunker et al.
Bending potential of the X 2S+ state
1999 Theodorakopoulos et al.
2003 Zaidi et al.
Calculation studies of MgOH
( and the other calculation works )
2000 Fukushima and Ishiwata
2009 LIF spectrum in jet of MgOH 12

4. The experimantal setup is the same as that used for our MgNC experiment.11

5. MgOH
A 2P – X 2S+ 10

6. large
ASO
spin splitting
ASO
small 9

7. Aeff = ASO <Lz> <Lz> = 1 <Lz> < 1 Mg z O H large
spin splitting
ASO
small 9

8. 8

9. 7

10. 6

11. 6

12. 5

13. 4

14. 4

15. 4

16. 2P - 2S 4

17. 2P - 2S
2S - 2S
2S - 2S 4

18. 3

19. (0400) m 2P
(0001) 2P
(0200) m 2P
(0000) 2P 2

20. (0400) m 2P
(0001) 2P
(0200) m 2P
(0000) 2P 2

21. (0400) m 2P
(0001) 2P
(0200) k 2P
(0200) m 2P
(0000) 2P 2

22. 2 (0400) m 2P (0001) 2P (0310) m 2S(+) (0200) k 2P (0200) m 2P

23. 2 (0400) m 2P (0001) 2P (0310) m 2S(+) (0111) k 2S(+) (0200) k 2P

24. 1

25. Summary
Electronic spectrum of jet cooled MgOH have been measured.
The vibronic structure of the A 2P state is discussed.
Rotational analysis of the complex band has not been completed.
Future works
Quantitative analysis of the vibronic structure of the A 2P state.
( model calculation )
Measurement of MgOD