Relative number of transitions for the transitions , and as a function of ratio, given by computer simulations and the analytic expressions in Eqs. (3)–(5).
Transmittance (a) and reflectance (b) as a function of wavelength for as-deposited and intercalated films. The values of are given in the figure.
Transmittance (a) and reflectance (b) as a function of wavelength for heavily intercalated films. The values of are given in the figure.
The absorption coefficients, , for substoichiometric amorphous films for different intercalation levels as a function of energy (a) and absorption coefficients, , obtained by subtraction of the absorption coefficient of the nonintercalated film [ in (a)] (b). The values of are given in the figure.
The total integrated absorption expressed in two ways: Total absorbed energy is denoted by square marks and the total absorption coefficient is denoted by circles. Data are given for a film as a function of .
The total absorption coefficient as a function of lithium intercalation level for , , and films. The dashed vertical line divides optically reversible inter/deintercalation from nonreversible ones. The irreversible films showed a residual color of light yellow brown after bleaching.
Integrated total absorption coefficients as a function of for Li intercalated amorphous tungsten oxide films. The strength of three superpositioned Gaussian peaks, positioned at energies of (peak 1), (peak 3), and (peak 2), were found by a fit to the absorption coefficient shown in Fig. 4(b). The data pertain to (a), (b), and (c) films.
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