Fig. 3: The spectra of transient complex refractive index in argon.
a, b Imaginary part of the relative complex refractive index changes with τDAPs = 5 fs and \({\tau }_{{DAPs}}=\)10 fs calculated from the relative amplitude shown in Fig. 2. These profiles are extracted and calculated from different \({\tau }_{{NIR}-{DAPs}}\) delays of −20, 0 and 30 fs. c, d Real part of the relative complex refractive index changes with \({\tau }_{{DAPs}}=\) 5 fs and \({\tau }_{{DAPs}}=\)10 fs calculated from the relative phase shown in Fig. 2. The dashed lines indicate the 3s-4p, 3s-5p, and 3s-6p transitions. The shaded areas represent the error bars of complex refractive index, which were estimated from standard deviation of five consecutive measurements.
