Calculations of molecular number densities as a function of optical depth in selected umbral, penumbral and photospheric models predict penumbral enhancement of diatomic molecules containing carbon atoms, strong umbral enhancement of oxides, and moderate umbral enhancement of hydrides. The role of CO formation in an oxygen rich atmosphere is discussed.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. DESCRIPTION OF UMBRAL AND PENUMBRAL MODELS
Ⅲ. EQUILIBRIUM SOLUTION FOR MOLECULAR DENSITIES
Ⅳ. MOLECULAR DENSITIES AS A FUNCTION OF OPTICAL DEPTH
Ⅳ. SUMMARY
REFERENCES

• H. M. LEE(Department of Astronomy, Seoul National University)
• D. W. KIM(Department of Astronomy, Seoul National University)
• H. S. YUN(Department of Astronomy, Seoul National University)
• R. BEEBE(Department of Astronomy, New Mexico State University)
• R. DAVIS(Department of Astronomy, New Mexico State University)