title: Note: Multi channel Doppler tuned spectrometer to study highly charged ions.
abstract: We describe the design and implementation of a multi channel Doppler tuned spectrometer setup to study physics of highly charged ions at high resolution in a direct way. A unique Soller slit assembly coupled with a long one dimensional position sensitive proportional counter enables us to get distinct x-ray peaks at different angles, which allows us to cover large number of angle in one shot. By using this setup, 1s2s (3)S1 - 1s(2) (1)S0 M1 transition in He-like Fe has been resolved from its satellite line 1s2s2p ⁴P(5/2)⁰ - 1s(2)2s (2)S(1/2) M2 transition in Li-like Fe and measured the lifetime of their respective upper levels with high precision.
authors.affiliation: Department of Physics, Jam. Co-operative College, Jamshedpur - 831036, India.
authors.forename: Ranjeet K
authors.initials: RK
authors.lastname: Karn
authors.affiliation: Department of Physics, Kolhan University, Chaibasa - 833201, India.
authors.forename: C N
authors.initials: CN
authors.lastname: Mishra
authors.affiliation: Department of Physics, University of Kashmir, Hazratbal, Sri Nagar - 190006, India.
authors.forename: Nissar
authors.initials: N
authors.lastname: Ahmad
authors.affiliation: Inter University Accelerator Centre, New Delhi - 110067, India.
authors.forename: S K
authors.initials: SK
authors.lastname: Saini
authors.affiliation: Inter University Accelerator Centre, New Delhi - 110067, India.
authors.forename: C P
authors.initials: CP
authors.lastname: Safvan
authors.affiliation: Inter University Accelerator Centre, New Delhi - 110067, India.
authors.forename: T
authors.initials: T
authors.lastname: Nandi