Collisional excitation of SiC${}_6$ by helium: cross sections, rate coefficients, and astrophysical implications

Liman Tian, Ziyu Xiang, Chuangang Ning +1

Rotational transitions of SiC${}_6$ with $j=26$--$40$ have been detected in IRC+10216, but collisional rate coefficients for SiC${}_6$ with He or H${}_2$ were previously unavailable. We…