Impact of Nonuniform Spatial Distribution of Ground-State Atoms on He I Line Intensity Ratio Analysis

抄録

This study developed a model to calculate the optical escape factor in consideration of the spatial distribution of ground-state (1¹S) helium atoms. Based on the improved model, the impact of spatially nonuniform distribution on the helium line intensity ratio (LIR) method was investigated. The LIR method reproduced the input n_e and T_e values with good agreement when the spatial distribution was considered appropriately, whereas n_e and T_e evaluated without considering the distribution exhibited considerable deviations. These results suggest that the spatial distribution of the 1¹S atoms can be a significant source of uncertainty in the helium LIR method.