Resonances for positron–helium and positron–lithium systems in kappa-distribution plasma

Abstract

S-wave resonances of positron-helium and positron-lithium systems in kappa-distribution plasmas are investigated using Hylleraas-type wave functions in the framework of the stabilization method. A model potential approach is used to represent the interactions between the outer electron, the positron and the core. The resonance parameters (position and width) of positron-helium and positron-lithium systems below the Ps(2s) threshold are reported as a function of screening parameter and spectral index of plasma.

The 3Po states of exotic molecular ions with exponential-cosine-screened Coulomb potentials

“…Furthermore, it is also relevant to search Borromean state, a bound state of three quantum particles that falls apart if one particle is taken away, for the P-state of the exotic molecular ions interacting with MDHP or ECSCP. Detail applications of Borromean states can be found from the published articles ( [3,29,[39][40][41][42][43], references therein)…”

“…In recent years, with the gradual development of plasma technology, the study on the structural properties of atomic and molecular systems under the influence of external environments is one of the hot research areas [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Several studies on the atomic systems under Debye screening and modified Debye screening are reported [15][16][17][18][19][20][21][22].…”

“…3 P o state energies of 𝑝𝑝𝜇 , 𝑑𝑑𝜇 and 𝑡𝑡𝜇 molecular ions with ECSCP, along with the 1S and 2S threshold energies of 𝑝𝜇, 𝑑𝜇 and 𝑡𝜇 atoms for different shielding parameters are calculated. Below the n=2 threshold, we have obtained four P-wave resonances for 𝑝𝑝𝜇 molecular ions and five P-wave resonances for 𝑑𝑑𝜇 and 𝑡𝑡𝜇 molecular ions embedded in the quantum plasma with different shielding parameters.…”