Physical Review A

Measurement of the P13 lifetime in Sr

Mark D. Havey, L. C. Balling, J. J. Wright

Published Mar 1, 1976• 29 citations

Abstract

The lifetime of the $^{3}P_{1}$ state of Sr has been measured by observing the intensity of the $5{s}^{2}^{1}S_{0}\ensuremath{\leftrightarrow}5s5p^{3}P_{1}$ fluorescence as a function of time, following the excitation of the $^{3}P_{1}$ state by a 1-\ensuremath{\mu}sec pulse from a flashlamppumped dye laser. The measured value of the $^{3}P_{1}$ lifetime is 21 \ifmmode\pm\else\textpm\fi{} 1 \ensuremath{\mu}sec.

DOI: 10.1103/physreva.13.1269

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Remeasurement of the Mg P13 -state lifetime

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Measurement of the lifetime of the P13 metastable state of Mg by dye-laser excitation

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Physical Review A

Measurement of the P13 lifetime in Sr

Mark D. Havey, L. C. Balling, J. J. Wright

Published Mar 1, 1976• 29 citations

Publisher

Abstract

The lifetime of the

^{3}P_{1}

state of Sr has been measured by observing the intensity of the

5{s}^{2}^{1}S_{0}\ensuremath{\leftrightarrow}5s5p^{3}P_{1}

fluorescence as a function of time, following the excitation of the

^{3}P_{1}

state by a 1-\ensuremath{\mu}sec pulse from a flashlamppumped dye laser. The measured value of the

^{3}P_{1}

lifetime is 21 \ifmmode\pm\else\textpm\fi{} 1 \ensuremath{\mu}sec.

DOI: 10.1103/physreva.13.1269

Related papers

Remeasurement of the Mg P13 -state lifetime

Paul S. Furcinitti, J. J. Wright, L. C. Balling

The lifetime of the metastable $^{3}P_{1}$ state of Mg has been remeasured by a dye-laser excitation technique. The metastable state was populated by an intense pulse of 4571-\AA{} radiation from a flashlamp-pumped dye laser, and the decay of the population was monitored by observing the absorption of 5173-\AA{} resonance radiation from a Mg discharge lamp. The measured value for the $^{3}P_{1}$ lifetime is 4.5 \ifmmode\pm\else\textpm\fi{} 0.5 msec.The lifetime of the metastable $^{3}P_{1}$ state of Mg has been remeasured by a dye-laser excitation technique. The metastable state was populated by an intense pulse of 4571-\AA{} radiation from a flashlamp-pumped dye laser, and the decay of the population was monitored by observing the absorption of 5173-\AA{} resonance radiation from a Mg discharge lamp. The measured value for the $^{3}P_{1}$ lifetime is 4.5 \ifmmode\pm\else\textpm\fi{} 0.5 msec.

Physical Review ASep 1, 197533 citations

Measurement of the lifetime of the P13 metastable state of Mg by dye-laser excitation

J. J. Wright, John F. Dawson, L. C. Balling

We have measured the lifetime of the $^{3}P_{1}$ metastable state of Mg and obtained a value of 2.2 \ifmmode\pm\else\textpm\fi{} 0.2 msec. The level was excited with a dye laser tuned to the intercombination line ($3s3p^{3}P_{1}\ensuremath{\leftrightarrow}3{s}^{2}^{1}S_{0}$). In addition to the $^{3}P_{1}$ state, the $^{3}P_{2}$ and $^{3}P_{0}$ levels were populated by mixing collisions owing to the presence of an inert buffer gas. The populations of all three metastable levels were monitored as a function of time by observing the absorption of Mg resonance radiation ($^{3}P_{0,1,2}\ensuremath{\rightarrow}^{3}S_{1}$) out of each level. The mixing time was short compared to the $^{3}P_{1}$ lifetime, so that the populations of the three metastable levels were in thermal equilibrium with each other. This produced an apparent lengthening of the $^{3}P_{1}$ lifetime, which would introduce a large systematic error if the degree of mixing were not known. Cenventionally, one observes the fluorescence from the excited levels to obtain their lifetimes. Because the lifetimes of the $^{3}P_{2}$ and $^{3}P_{0}$ states are too long, fluorescence from these states cannot be observed, and the observation of fluorescence from the $^{3}P_{1}$ state alone provides insufficient information to determine its lifetime.We have measured the lifetime of the $^{3}P_{1}$ metastable state of Mg and obtained a value of 2.2 \ifmmode\pm\else\textpm\fi{} 0.2 msec. The level was excited with a dye laser tuned to the intercombination line ($3s3p^{3}P_{1}\ensuremath{\leftrightarrow}3{s}^{2}^{1}S_{0}$). In addition to the $^{3}P_{1}$ state, the $^{3}P_{2}$ and $^{3}P_{0}$ levels were populated by mixing collisions owing to the presence of an inert buffer gas. The populations of all three metastable levels were monitored as a function of time by observing the absorption of Mg resonance radiation ($^{3}P_{0,1,2}\ensuremath{\rightarrow}^{3}S_{1}$) out of each level. The mixing time was short compared to the $^{3}P_{1}$ lifetime, so that the populations of the three metastable levels were in thermal equilibrium with each other. This produced an apparent lengthening of the $^{3}P_{1}$ lifetime, which would introduce a large systematic error if the degree of mixing were not known. Cenventionally, one observes the fluorescence from the excited levels to obtain their lifetimes. Because the lifetimes of the $^{3}P_{2}$ and $^{3}P_{0}$ states are too long, fluorescence from these states cannot be observed, and the observation of fluorescence from the $^{3}P_{1}$ state alone provides insufficient information to determine its lifetime.

Physical Review AJan 1, 197420 citations

Measured Lifetime of the ( 3p54s ) P13 State of Argon

John L. Morack, Clifford E. Fairchild

A direct measurement of the natural lifetime for the ( $3{p}^{5}4s$ ) $^{3}P_{1}$ state of argon has been made using a modified delayed-coincidence method. Argon atoms are repetitively excited by pulses of electrons. For each pulse, the decaying light signal is sampled for a time $\ensuremath{\Delta}t$ at some delay time ${t}_{1}$ after the excitation is terminated. The exponential decay is then reconstructed as the delay time is changed. Collision effects are not important in the pressure region (5.0\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$-2.0\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ Torr) of the experiment and the effects due to cascading are eliminated by keeping the energy of the bombarding electrons low enough so that excitation of the $3{p}^{5}4p$ levels is negligible. The measured lifetime is dependent upon the argon pressure, and this effect is attributed to resonance trapping; a value of 21\ifmmode\pm\else\textpm\fi{}2 nsec is obtained for the natural lifetime by using the existing theories of resonance trapping to extrapolate the data to zero pressure.A direct measurement of the natural lifetime for the ($3{p}^{5}4s$) $^{3}P_{1}$ state of argon has been made using a modified delayed-coincidence method. Argon atoms are repetitively excited by pulses of electrons. For each pulse, the decaying light signal is sampled for a time $\ensuremath{\Delta}t$ at some delay time ${t}_{1}$ after the excitation is terminated. The exponential decay is then reconstructed as the delay time is changed. Collision effects are not important in the pressure region (5.0\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$-2.0\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ Torr) of the experiment and the effects due to cascading are eliminated by keeping the energy of the bombarding electrons low enough so that excitation of the $3{p}^{5}4p$ levels is negligible. The measured lifetime is dependent upon the argon pressure, and this effect is attributed to resonance trapping; a value of 21\ifmmode\pm\else\textpm\fi{}2 nsec is obtained for the natural lifetime by using the existing theories of resonance trapping to extrapolate the data to zero pressure.

Physical ReviewNov 5, 196718 citations

Lifetime and oscillator-strength studies involving the (6s6p )3 P1 -(6s7s )1 S0 transition of atomic Yb

Yu Bai, THOMAS W. MOSSBERG

The oscillator strength of the (6s6p ${)\mathrm{}}^{3}$ ${P}_{1}$ -(6s7s ${)\mathrm{}}^{1}$ ${S}_{0}$ transition and the lifetime of the (6s7s ${)\mathrm{}}^{1}$ ${S}_{0}$ state in $^{174}\mathrm{Yb}$ have been measured to be (8.0\ifmmode\pm\else\textpm\fi{}1.6)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ and 45.8\ifmmode\pm\else\textpm\fi{}1.0 nsec, respectively. The former value was obtained by use of coherent optical techniques (optical nutation and ac Stark splitting), while the latter was obtained by monitoring cascade fluorescence following pulsed excitation.The oscillator strength of the (6s6p${)\mathrm{}}^{3}$${P}_{1}$-(6s7s${)\mathrm{}}^{1}$${S}_{0}$ transition and the lifetime of the (6s7s${)\mathrm{}}^{1}$${S}_{0}$ state in $^{174}\mathrm{Yb}$ have been measured to be (8.0\ifmmode\pm\else\textpm\fi{}1.6)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ and 45.8\ifmmode\pm\else\textpm\fi{}1.0 nsec, respectively. The former value was obtained by use of coherent optical techniques (optical nutation and ac Stark splitting), while the latter was obtained by monitoring cascade fluorescence following pulsed excitation.

Physical Review AJan 1, 198711 citations

Radiative lifetimes, diffusion and energy pooling of Sr(5s5p(3PJ)) and Sr(5s4d(1D2)) studied by time-resolved atomic emission following pulsed dye-laser excitation

David Husain, Gareth O. Roberts

Chemical PhysicsNov 1, 198836 citations

Lifetime of the 2P11 and 3P11 States of Atomic Helium

James M. Burger, Allen Lurio

The radiative lifetime of the $2^{1}P_{1}$ and $3^{1}P_{1}$ state of atomic helium has been measured by the level-crossing technique. In the experiment, a beam of $2^{1}S_{0}$ metastable atoms was first produced and then excited to the $2^{1}P_{1}$ or $3^{1}P_{1}$ state with resonance radiation. The lifetimes were measured by observing the zero-field level-crossing signals in the detected 584- or 537-\AA{} fluorescent radiation when these $^{1}P_{1}$ states decayed to the $1^{1}S_{0}$ ground state. The results are $\ensuremath{\tau} (2^{1}P_{1})=(5.57\ifmmode\pm\else\textpm\fi{}0.15)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ sec and $\ensuremath{\tau} (3^{1}P_{1})=(1.73\ifmmode\pm\else\textpm\fi{}0.11)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ sec. These values are in excellent agreement with theory.The radiative lifetime of the $2^{1}P_{1}$ and $3^{1}P_{1}$ state of atomic helium has been measured by the level-crossing technique. In the experiment, a beam of $2^{1}S_{0}$ metastable atoms was first produced and then excited to the $2^{1}P_{1}$ or $3^{1}P_{1}$ state with resonance radiation. The lifetimes were measured by observing the zero-field level-crossing signals in the detected 584- or 537-\AA{} fluorescent radiation when these $^{1}P_{1}$ states decayed to the $1^{1}S_{0}$ ground state. The results are $\ensuremath{\tau} (2^{1}P_{1})=(5.57\ifmmode\pm\else\textpm\fi{}0.15)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ sec and $\ensuremath{\tau} (3^{1}P_{1})=(1.73\ifmmode\pm\else\textpm\fi{}0.11)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ sec. These values are in excellent agreement with theory.

Physical Review AJan 1, 197121 citations

The lifetime of the

^{3}P_{1}

state of Sr has been measured by observing the intensity of the

5{s}^{2}^{1}S_{0}\ensuremath{\leftrightarrow}5s5p^{3}P_{1}

fluorescence as a function of time, following the excitation of the

^{3}P_{1}

state by a 1-\ensuremath{\mu}sec pulse from a flashlamppumped dye laser. The measured value of the

^{3}P_{1}

lifetime is 21 \ifmmode\pm\else\textpm\fi{} 1 \ensuremath{\mu}sec.

The lifetime of the metastable

^{3}P_{1}

state of Mg has been remeasured by a dye-laser excitation technique. The metastable state was populated by an intense pulse of 4571-\AA{} radiation from a flashlamp-pumped dye laser, and the decay of the population was monitored by observing the absorption of 5173-\AA{} resonance radiation from a Mg discharge lamp. The measured value for the

^{3}P_{1}

lifetime is 4.5 \ifmmode\pm\else\textpm\fi{} 0.5 msec.

We have measured the lifetime of the

^{3}P_{1}

metastable state of Mg and obtained a value of 2.2 \ifmmode\pm\else\textpm\fi{} 0.2 msec. The level was excited with a dye laser tuned to the intercombination line ($3s3p^{3}P_{1}\ensuremath{\leftrightarrow}3{s}^{2}^{1}S_{0}$). In addition to the

^{3}P_{1}

state, the

^{3}P_{2}

and

^{3}P_{0}

levels were populated by mixing collisions owing to the presence of an inert buffer gas. The populations of all three metastable levels were monitored as a function of time by observing the absorption of Mg resonance radiation ($^{3}P_{0,1,2}\ensuremath{\rightarrow}^{3}S_{1}$) out of each level. The mixing time was short compared to the

^{3}P_{1}

lifetime, so that the populations of the three metastable levels were in thermal equilibrium with each other. This produced an apparent lengthening of the

^{3}P_{1}

lifetime, which would introduce a large systematic error if the degree of mixing were not known. Cenventionally, one observes the fluorescence from the excited levels to obtain their lifetimes. Because the lifetimes of the

^{3}P_{2}

and

^{3}P_{0}

states are too long, fluorescence from these states cannot be observed, and the observation of fluorescence from the

^{3}P_{1}

state alone provides insufficient information to determine its lifetime.

A direct measurement of the natural lifetime for the (

3{p}^{5}4s

)

^{3}P_{1}

state of argon has been made using a modified delayed-coincidence method. Argon atoms are repetitively excited by pulses of electrons. For each pulse, the decaying light signal is sampled for a time $\ensuremath{\Delta}t$ at some delay time

{t}_{1}

after the excitation is terminated. The exponential decay is then reconstructed as the delay time is changed. Collision effects are not important in the pressure region (5.0\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$-2.0\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ Torr) of the experiment and the effects due to cascading are eliminated by keeping the energy of the bombarding electrons low enough so that excitation of the

3{p}^{5}4p

levels is negligible. The measured lifetime is dependent upon the argon pressure, and this effect is attributed to resonance trapping; a value of 21\ifmmode\pm\else\textpm\fi{}2 nsec is obtained for the natural lifetime by using the existing theories of resonance trapping to extrapolate the data to zero pressure.

The oscillator strength of the (6s6p

{)\mathrm{}}^{3}

{P}_{1}

-(6s7s

{)\mathrm{}}^{1}

{S}_{0}

transition and the lifetime of the (6s7s

{)\mathrm{}}^{1}

{S}_{0}

state in

^{174}\mathrm{Yb}

have been measured to be (8.0\ifmmode\pm\else\textpm\fi{}1.6)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ and 45.8\ifmmode\pm\else\textpm\fi{}1.0 nsec, respectively. The former value was obtained by use of coherent optical techniques (optical nutation and ac Stark splitting), while the latter was obtained by monitoring cascade fluorescence following pulsed excitation.

The radiative lifetime of the

2^{1}P_{1}

and

3^{1}P_{1}

state of atomic helium has been measured by the level-crossing technique. In the experiment, a beam of

2^{1}S_{0}

metastable atoms was first produced and then excited to the

2^{1}P_{1}

3^{1}P_{1}

state with resonance radiation. The lifetimes were measured by observing the zero-field level-crossing signals in the detected 584- or 537-\AA{} fluorescent radiation when these

^{1}P_{1}

states decayed to the

1^{1}S_{0}

ground state. The results are $\ensuremath{\tau} (2^{1}P_{1})=(5.57\ifmmode\pm\else\textpm\fi{}0.15)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ sec and $\ensuremath{\tau} (3^{1}P_{1})=(1.73\ifmmode\pm\else\textpm\fi{}0.11)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ sec. These values are in excellent agreement with theory.