Abstract
The aluminum carbide radical has been seen in the gas phase for the first time. The B 4ΣX 4Σ system near 22 000 cm−1 was observed in emission from a hollow cathode source. Three vibrational sequences were detected: Δv=0, −1, and −2, and a full rotational analysis was performed on the five strongest bands, 0‐0, 1‐1, 0‐1, 1‐2, and 2‐3.