Linestrengths in the 3-0 vibration-rotational band of gaseous ¹H³⁵Cl and the electric dipole moment function

Linestrengths in the 3-0 band of ¹H³⁵Cl and ¹H³⁷Cl have been remeasured. The mean value obtained for the pure vibrational transition matrix element < 0|M(R)| 3 > of ¹HCl is + (1.875 ± 0.024) × 10^-33 C m. Based on this value, a value of < 0|M(R)| 2 > from Boulet et al. which is confirmed, and other published data, a new determination of the electric dipole moment function of HCl has been made in both the M(x) and M(z) representations.