Dear All,<br><br>Does 'occupations=from_input' mean occupations of individual states<br>are fixed ?<br><br>Can I define the occupations of the highest occupied state and lowest <br>unoccupied state to be 1 and 1 to calculate the electron-hole excitation<br>
energy?<br><br>Thanks for any comments.<br><br>Jie<br>