The 2ν1 overtone band of H28SiD3

► The 2ν1 Si−H stretching overtone of HSiD3 is recorded at 0.009 cm−1 of resolution. ► In total, 790 transitions with J′ up to 24 and K up to 21 have been assigned. ► The A1/E Coriolis interactions are effective between v1 = 2 and nearby dark states. ► Ro-vibration analysis is done either neglecting or including the Coriolis terms.