1. School of Chemistry, University of Nottingham, Nottingham NG7 2 RD, United
Kingdom
2. Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
3. B.I. Stepanov Institute of Physics, Minsk, Belarus
4. Central Laser Facility, Science
and Technology Facilities Council, Rutherford Appleton Laboratory, OX11 0QX, United Kingdom