Abstract: We experimentally addressed the subject of ionospheric disturbances by releasing chemicals.The influence of the pressure on the electron capture ability of chemicals, including Fe (CO) ₅, CO, CO₂ and SF₆, was investigated in cathode ray tube (CRT) and ion mobility spectrometry (IMS) methods.The results show that in 1~4 Pa pressure range, Fe (CO) ₅ exhibited excellent electron-capture ability.To be specific, as the flow-rate of Fe (CO) ₅ in the purging gas mixture increased, its e-capture ability significantly increased.When it comes to ionospheric electron disturbance with the same number of molecules, Fe (CO) ₅ outperforms CO and CO₂, because of a stronger e-capture ability.In addition, Fe (CO) ₅ is much less toxic to humans than other metal carbony compounds such as Ni (CO) ₄.We suggest that Fe (CO) ₅ may be a promising ionospheric electron disturbance material.