1. High Resolution Laser Induced Fluorescence Spectroscopic Study of RuF Timothy C. Steimle, Wilton L. Virgo Tongmei Ma The 60 th International Symposium on Molecular Spectroscopy and CoF Funded by: DoE-BES

2. Motivation  Establish trends in bonding; provide test data for theoretical calculations. Diatomics : OXIDESNITRIDES CARBIDES Very few halides!!! -1-  Provide the most fundamental property ― dipole moments  FLUORIDES

3. Spectroscopic history of RuF  RuF -2- and CoF  CoF – None! – Adam et al:[18.8] 3  - X 3  ; medium res. LIF spectra – Ram et al:[10.3] 3  - X 3 , C 3  - X 3 , D 3  - X 3  and G 3  - C 3  ; near-IR FT spectra Conclusion: X 3  is an inverted ground state with the X 3  4 spin-component lying lowest; X 3  4 is fully characterized. – Okabayashi et al:X 3  4 ground state; mm-wave abs. spectra

4. Experimental approach RuF and CoF skimmed mol. beam: Pulse Valve /Ablation Source SF 6 (2%) + Ar Plasma Pulse Valve 355 nm Nd:YAG Pulse Laser Ru or Co Rod -3-

5. Stark plates Optical Stark spectroscopy Near natural line width optical spectroscopy: High- resolution LIF spectrometer -4-

6. Survey scan for Ru/SF 6  products -5-  Today’s talk P(?) Q(?) R(?) Results and Discussion

7. -6- RuF is isovalent with FeF But: Ru + :4d 7 and Fe + :3d 6 4s 1 FeF: 6  -X 6  T 00 ~30300 cm -1 ; 6  -X 6  T 00 ~31000 cm-1 Ab initio calc a. for RuF  X 4  I; r e =2.05 Å (B=0.251 cm -1 ) a Per E. Siegbahn, Theor. Chim. Acta (1993) 86, 219 RuF  X 4  9/2  FeF  X 6  9/2

8. High-resolution spectra of RuF -7- P (?) Q (?) R (?)

9. Fluorine hyperfine splitting -8-

10. Stark Spectra of first Q(?R) branch  Eleven components!  Nine components! -9- F=4 F=5 J=4.5  =4.5!!

11. Stark Spectra of R(?) branch Can’t be resolved  High J ! -10-

12. Possible Cases -11- P-branch R-branch(Low-J), R(4.5) R-branch(High J) 4  11/2 - X 4  9/2 Comb/Diff.  B”  0.285 & B’  0.287 Reasonable! P Q(4.5) R 4  9/2 - X 4  7/2 Comb/Diff.  B’’  0.624 Too large!!! 4  7/2 - X 4  9/2 4  9/2 - X 4  9/2

13. Concluding Remarks for RuF -12-  Two new band systems have been observed for RuF. High-resolution spectra have been recorded for the visible band system and hyperfine splitting can be observed.  4  11/2 - X 4  9/2, B’’=0.285; B’=0.287, consistent with ab initio prediction.  Through stark measurement,  3.6D  One anomalous factor we can’t explain is the missing Q branch.

14. Low-resolution LIF spectra of CoF Q P R [18.8] 3  4 - X 3  4 -13-

15. High-resolution LIF spectra of CoF: R(4) branch of (0,0) band of the 3  4 - X 3  4 transition -14- [18.8] 3  4, J=5 X 3  4, J=4 Relative Energy Level  F=1  F=0

16. [a] Values taken from Ref.: T. Okabayashi and M. Tanimoto, J. Mol. Spectro., 221, 149 (2003). Parameter X 3  4 [a] [18.8] 3  4 T 0 0.0 18908.23251 B 0 0.388098 0.376707 D 0 0.512967  10 -6 0.512967  10 -6 H 0 -0.225922  10 -11 -0.225922  10 -11 a(Co) 0.0108068 0.031742 a D (Co) -0.194007  10 -5 -0.194007  10 -5 eqQ(Co) -0.003043 0.0 b F (F) 0.008281 0.009384 RMS 0.00316 Molecular Constants for the [18.8] 3  4 of CoF (cm -1 )  (D) 2.4845 1.2137 -15- error 0.1263 0.2270.

17.  Hyperfine LIF spectra of the transition [18.8] 3  4 - X 3  4 has been recorded field free and in the presence of static electric fields. Both two nuclear spin splittings can be observed. Both excited and ground states have F hyperfine spltting in CoF, which is consistent with in RuF.  The predicted spectra agree quite well with the observed spectra which means that our model system works good.  The hyperfine molecular constants for [18.8] 3  4 state and  of the two states were obtained. -16- Concluding Remarks for CoF

19. J=4 X34X34 F1=7.5 F1=6.5 F1=5.5 F1=4.5 F1=3.5 F1=2.5 F1=1.5 F1=0.5 F1=7.5 F1=6.5 F1=5.5 F1=4.5 F1=3.5 F1=2.5 F1=1.5 F1=8.5 Two nuclear spin splittings observed in CoF -appendix- 59 Co(I=7/2) J=5 [18.8] 3  4 I F =1/2 F 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 8 7 7 6 6 5 5 4 4 3 3 2 2 1 8 9  F=1  F=0