1. Wendy W. Chen, Thomas C. Galvin, Thomas J. Houlahan, and J. Gary Eden
ANALYSIS OF VIBRONIC EMISSION SPECTRA OF SCANDIUM MONOIODIDE PRODUCED BY PHOTODISSOCIATION OF ScI3
Wendy W. Chen, Thomas C. Galvin, Thomas J. Houlahan, and J. Gary Eden
UNIVERSITY OF ILLINOIS
June 16, 2014

2. OVERVIEW
Fluorescence of scandium monoiodide (ScI) was generated by photodissociation of ScI3 at 248 nm (KrF laser)
Resolution of spectra is ~0.07 nm over the nm range. Accuracy of line positions is ~1.9 cm-1
New electronic transitions were observed and vibrationally analyzed

3. MOTIVATION
Scandium is the first transition metal element. The influence of d electron on excited state structure is of interest
Scandium monohalide plays an important role for development of metal halide lamps

4. PREVIOUSLY REPORTED ELECTRONIC STATES OF ScI
Singlets Triplets

5. EXPERIMENTAL SETUP

6. PANORAMIC VIEW: 300 – 1000 nm

7. PREVIOUSLY REPORTED RANGE

8. SPECTRA IN 455 nm REGION

9. VIBRATIONAL CONSTANTS
ωe' = cm ωe'χe' = 0.79 cm-1
ωe'' = cm ωe''χe''= 0.72 cm-1
Te = cm-1
Root-mean-square (RMS) uncertainty is 0.2 cm-1
For comparison:
ground state (X1Σ+)[1]:
ωe = cm ωeχe = cm-1
[1] Z.H. Xia et.al, Journal of Molecular Spectroscopy 268 (2011)

10. SPECTRA IN 913 nm REGION

11. VIBRATIONAL CONSTANTS (GROUP A)
Simulating observed spectrum with reported state constants, the minimum RMS uncertainty achieved is cm-1 for the 3Π state:
ωe'' = cm ωe''χe''= cm-1
Te'' = cm-1
Simulated constants obtained for the upper state:
ωe' = cm ωe'χe' = 0.72 cm-1
Te' = cm-1

12. SPECTRA IN 890 - 920 nm RANGE (GROUP B)

13. VIBRATIONAL CONSTANTS (GROUP B)
ωe' = cm-1 ωe'χe' = 0.82 cm-1 ωe'' = cm-1 ωe''χe''= 0.67 cm-1 Te = cm-1 RMS uncertainty is 0.2 cm-1

14. CONCLUSION
Spectra of the ScI molecule from 300 nm to 1000 nm with KrF excimer laser (248 nm) photoexcitation were reported
Several new electronic and vibrational transitions of ScI were observed and analyzed