B.1.11 Keyword: $multipole_field

A multipole field can be applied to the molecule under investigation by specifying the $multipole_field input section. Each line in this section consists of a single component of the applied field, in the following format:

$multipole_field
   field_component_1   value_1
   field_component_2   value_2
$end

Each field_component is stipulated using the Cartesian representation: $x$, $y$, or $z$ for dipole field components; $xx$, $xy$, etc. for quadrupole field components, $\mathrm{\dots }$. The value of each field component should be provided in atomic units. Contrary to the convention in many textbooks, within Q-Chem electric field lines are defined to run from negative charge to positive charge. ¹¹¹³ Shaik S. et al.
Chem. Soc. Rev.
(2018), 47, pp. 5125. Link ^{, 1112} Shaik S. et al.
J. Am. Chem. Soc.
(2020), 142, pp. 12551. Link