  Electronic circular dichroism (ECD) is a powerful spectroscopical method for
investigating chiral properties at the molecular level. ECD calculations with
the commonly used linear-response time-dependent density functional theory
(LR-TDDFT) framework can be prohibitively costly for large systems. To
alleviate this problem, we present here an ECD implementation for the projector
augmented-wave method in the real-time-propagation TDDFT (RT-TDDFT) framework
in the open-source GPAW code. Our implementation supports both local atomic
basis set and real-space finite-difference representations of wave functions.
We benchmark our implementation against an existing LR-TDDFT implementation in
GPAW for small chiral molecules. We then demonstrate the efficiency of our
local atomic basis set implementation for a large hybrid nanocluster.
