Huang-Rhys 1950 dimensionless S = M omega d^2 / (2 hbar) measuring electron-phonon coupling strength; controls Franck-Condon vibrational progression intensity; small-S = sharp 0-0 line, large-S = broad sideband.
Huang-Rhys 1950 dimensionless S = M omega d^2 / (2 hbar) measuring electron-phonon coupling strength; controls Franck-Condon vibrational progression intensity; small-S = sharp 0-0 line, large-S = broad sideband.