CCL:G: emission spectra

["aloysius bella a" <aloysius.bella^_^gmail.com>]

 Sent to CCL by: "aloysius bella a" [aloysius.bella++gmail.com]
 Hi all,
 i am doing  tddft calculations for pi conjugated systems to find emission
 spectra.To study this,i am following the gaussian user reference (http://www.gaussian.com/g_tech/g_ur/k_scrf.htm,) in
 that,there are 7 steps are given to find emission spectra.I could proceed all
 the steps that are given for the sample molecule(acetaldehyde).
 But in my case, i am struggling to proceed the 4th step. I dont know how to
 modify the torsional angle for my molecule. Is there any thumb rule to perturb
 the molecule? What should i do to proceed further? Kindly reply. Lot of thanks
 in advance.
 A. Bella.
 aloysius.bella],[gmail.com