Fig. 3: Principal component analysis.
From: Ultrafast probing of isotope-induced explicit symmetry breaking in ethylene
The absolute values of the principal component coefficients with D3 initial electronic state for a C2H4, b 13C2H4, and c, 13C12CH4. Note the mixing between different normal modes (denoted by dashed circle) in ethylene-13C following the loss of the g/u-symmetry. The explained variance ratio for different principal components are shown in Supplementary Fig. 7.
