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




New Atomic Data for Singly Ionised Nickel (Ni II)

Nickel has the second highest cosmic abundance of the iron group elements. Its complex structure produces a densely distributed spectrum extending from the infrared to the vacuum ultraviolet and spectral lines of singly-ionised nickel (Ni II) are found in a wide variety of astrophysical spectra.

My current research aims to produce an order-of-magnitude increase in the accuracy of Ni II atomic data. High-resolution Fourier transform and grating spectroscopy have been used across a wide spectral range (IR to VUV) to collect spectra from Ni-He hollow cathode light sources and extensive term analyses carried out to improve transition wavelengths, energy levels and transition probabilities. 

Conference Contributions

show research
  • IAUGA 2022 (Busan, South Korea). Atomic Data from the UV to the IR (Invited Keynote)
  • ASOS-13 (Shanghai, China). New Atomic Data of Ni II for Astrophysical Applications (Poster)
  • ICAMDATA 2018 (Cambridge, MA, USA). New Atomic data for Astrophysics: Wavelengths and Energy Levels (Contributed Talk)
  • EWASS 2018 (Liverpool, UK). New Atomic Data of Ni II for Astrophysical Applications (Contributed Talk)
  • NAM 2017 (Hull, UK). New Atomic Data of Singly-ionised Nickel (Ni II) (Poster)
  • ASOS-12 (São Paulo, Brazil). New Accurate Atomic Data for Astrophysics Applications by High Resolution Fourier Transform and Grating Spectroscopy (Poster)