The ionization of magnesium vapor by resonant and off-resonant laser irradiation was investigated for the first time.Enhancement of ion signals was observed at the 3s^(2)-3s4d ^(1)D and 3s^(2)-3s5s ^(1)S two-photon at...The ionization of magnesium vapor by resonant and off-resonant laser irradiation was investigated for the first time.Enhancement of ion signals was observed at the 3s^(2)-3s4d ^(1)D and 3s^(2)-3s5s ^(1)S two-photon atomic resonances.A"hybrid resonance"was detected which involves the production of 3s3p-^(1)P atoms from molecular magnesium.Doubly charged ions by laser radiation tuned to one and two-photon resonance levels of Mgll were produced.展开更多
A new experimental phenomenon-resonance dip(weakening)of multiphoton ionization in Mg vapor with 3s,3p ^(1)P as an intermediate state has been observed.Photoionization and coherent radiation at 5183.7Å,accompanie...A new experimental phenomenon-resonance dip(weakening)of multiphoton ionization in Mg vapor with 3s,3p ^(1)P as an intermediate state has been observed.Photoionization and coherent radiation at 5183.7Å,accompanied by ionization dip when Mg vapor pressure was high enough,were studied simultaneously as functions of vapor pressure,laser power density and buffer gas pressure.Possible contributions to ionization dip and coherent radiation are discussed.展开更多
It is pointed out by the ordinary theory and experiment of the Cerenkov radiation that the Cerenkov radiation of continuum spectra will be produced when the velocity of the charged particles is faster than the phase v...It is pointed out by the ordinary theory and experiment of the Cerenkov radiation that the Cerenkov radiation of continuum spectra will be produced when the velocity of the charged particles is faster than the phase velocity c/n of photons in the medium through which they are moving. The moving direction of photons is determined by the following formula:展开更多
文摘The ionization of magnesium vapor by resonant and off-resonant laser irradiation was investigated for the first time.Enhancement of ion signals was observed at the 3s^(2)-3s4d ^(1)D and 3s^(2)-3s5s ^(1)S two-photon atomic resonances.A"hybrid resonance"was detected which involves the production of 3s3p-^(1)P atoms from molecular magnesium.Doubly charged ions by laser radiation tuned to one and two-photon resonance levels of Mgll were produced.
文摘A new experimental phenomenon-resonance dip(weakening)of multiphoton ionization in Mg vapor with 3s,3p ^(1)P as an intermediate state has been observed.Photoionization and coherent radiation at 5183.7Å,accompanied by ionization dip when Mg vapor pressure was high enough,were studied simultaneously as functions of vapor pressure,laser power density and buffer gas pressure.Possible contributions to ionization dip and coherent radiation are discussed.
文摘It is pointed out by the ordinary theory and experiment of the Cerenkov radiation that the Cerenkov radiation of continuum spectra will be produced when the velocity of the charged particles is faster than the phase velocity c/n of photons in the medium through which they are moving. The moving direction of photons is determined by the following formula:
