The Cs atoms are prepared in the 6D state by two−photon absorption.CsH(X^(1)Σ+,v"=0)is generated from the Cs(6D)+H2 reaction.By overtone excitation with a pulsed dye laser,highly vibrational states v"≥15 o...The Cs atoms are prepared in the 6D state by two−photon absorption.CsH(X^(1)Σ+,v"=0)is generated from the Cs(6D)+H2 reaction.By overtone excitation with a pulsed dye laser,highly vibrational states v"≥15 of CsH in its ground electronic state are obtained.A diode laser is used to probe either the prepared vibrational state or the collisionally populated states.The decay signal of the time−resolved fluorescence from the A1Σ+(v')→X^(1)Σ+(v")transition is monitored.Based on the Stern–Volmer equation,the total rate coefficients for v"=15–22 are yielded.The time evolution and relative intensities of three related states,v",v"−1 and v"−2,made by the initially prepared v"state of CsH are measured.Rate coefficients of single−and double-quantum relaxation are obtained.These results show that single-quantum relaxation accounts for≥50%of the total relaxation out of states v"=17–20.Multiquantum relaxation(Δv≥2)makes major contribution(≥62%)to the vibrational relaxation at v"=21 and 22.A simple explanation is given.展开更多
文摘The Cs atoms are prepared in the 6D state by two−photon absorption.CsH(X^(1)Σ+,v"=0)is generated from the Cs(6D)+H2 reaction.By overtone excitation with a pulsed dye laser,highly vibrational states v"≥15 of CsH in its ground electronic state are obtained.A diode laser is used to probe either the prepared vibrational state or the collisionally populated states.The decay signal of the time−resolved fluorescence from the A1Σ+(v')→X^(1)Σ+(v")transition is monitored.Based on the Stern–Volmer equation,the total rate coefficients for v"=15–22 are yielded.The time evolution and relative intensities of three related states,v",v"−1 and v"−2,made by the initially prepared v"state of CsH are measured.Rate coefficients of single−and double-quantum relaxation are obtained.These results show that single-quantum relaxation accounts for≥50%of the total relaxation out of states v"=17–20.Multiquantum relaxation(Δv≥2)makes major contribution(≥62%)to the vibrational relaxation at v"=21 and 22.A simple explanation is given.
