Imperial College London

Dr. Christian Clear

Faculty of Natural SciencesDepartment of Physics

Research Fellow



+44 (0)20 7594 8184c.clear14 Website




H720BHuxley BuildingSouth Kensington Campus





I am a research fellow in the Fourier-transform Spectroscopy laboratory (group webpage), working with Prof. Juliet Pickering as part of the Space and Atmospheric Physics (SPAT) group. I was awarded my PhD in Laboratory Astrophysics from Imperial College London in 2018 and before that my BSci (Hons) in Physics from the University of Bath in 2009.

My research is focussed on the measurement of fundamental atomic data for astrophysically-important elements using high-resolution spectroscopy.

Selected Publications

Journal Articles

Clear CP, Uylings P, Raassen T, et al., 2023, New Ritz wavelengths and transition probabilities for parity-forbidden, singly ionized nickel [Ni II] lines of astrophysical interest, Monthly Notices of the Royal Astronomical Society, Vol:519, ISSN:0035-8711, Pages:4040-4046

Clear CP, Pickering JC, Nave G, et al., 2022, Wavelengths and energy levels of singly ionized nickel (Ni ii) measured using fourier transform spectroscopy, Astrophysical Journal Supplement Series, Vol:261, ISSN:0067-0049, Pages:35-35

Nave G, Clear C, 2021, Reference wavelengths of Si ii, C ii, Fe i, and Ni ii for quasar absorption spectroscopy, Monthly Notices of the Royal Astronomical Society, Vol:502, ISSN:0035-8711, Pages:5679-5685

Pickering JC, Teresa Belmonte M, Clear CP, et al., 2020, Recent advances in experimental laboratory astrophysics for stellar astrophysics applications and future data needs, Proceedings of the International Astronomical Union, Vol:15, ISSN:1743-9213, Pages:220-228

Belmonte MT, Pickering JC, Clear CP, et al., 2018, The laboratory astrophysics spectroscopy programme at Imperial College London, Galaxies, Vol:6, ISSN:2075-4434

Rhodin AP, Belmonte MT, Engstrom L, et al., 2017, Lifetime measurements and oscillator strengths in singly ionized scandium and the solar abundance of scandium, Monthly Notices of the Royal Astronomical Society, Vol:472, ISSN:0035-8711, Pages:3337-3353

Nave G, Sansonetti CJ, Townley-Smith K, et al., 2017, Comprehensive atomic wavelengths, energy levels, and hyperfine structure for singly ionized iron-group elements, Canadian Journal of Physics, Vol:95, ISSN:0008-4204, Pages:811-816

More Publications