Figure 2
From: Effects of ultrashort laser pulses on angular distributions of photoionization spectra
The red curve is \({{\rm{\Sigma }}}_{c}(s)={\int }_{0}^{s}g(s^{\prime} )\,\cos \,(10s^{\prime} )\,ds^{\prime} \) with pulse envelope \(g(s)=s\mathrm{(2}-s)\), showing nonperiodic values of stationary points on s when the curve intersects the (blue) dash line which represents a constant value on the right hand side of Eq. 46. The black curve is \({\int }_{0}^{s}\,\cos \,\mathrm{(10}s^{\prime} )\,ds^{\prime} \) giving the periodic intersection points.
