The Stark effect at high electric fields in the near-infrared spectrum of atomic carbon

Studies of the static Stark effect for the near-infrared lines: 833.514 nm, 906.143 nm, 906.247 nm, 907.828 nm, 908.851 nm, 909.483 nm, 911.180 nm, 940.573 nm, 960.303 nm, and 962.078 nm (air wavelengths) of atomic carbon are reported. From the Stark patterns recorded at very high electric fields up to 660 kV/cm the differences of the scalar polarizabilities $\Delta {\alpha }_0$ for the investigated lines were determined. The tensor polarizabilities ${\alpha }_2$ were found to be very small and below the capabilities of the current experience. For all lines, the following are the first experimental results.

The polarizabilities ${\alpha }_0$ and ${\alpha }_2$ have been calculated for investigated levels of the 2s${}^2$2p3s and 2s${}^2$2p3p configurations based on the experimental results. The agreement between the calculation and experimental results is very good. This allowed for the prediction of reliable values for other lines involving the studied energy levels in this difficult spectral range. The presented data should serve as a basis for the analysis of the Stark and ion broadening in a plasma.