METHOD FOR THE MEASUREMENT OF THE LIFETIME OF THE EXCITED STATE OF AN ATOM

O. Aminian

Published Jul 16, 1962• 0 citations

Abstract

An electronic method for improving the delayed coincidence method in the measurement of the lifetime of the. excited state of an atom is proposed. A gate circuit which used tunnel diodes was studied. For the tunnel diode 1 N 3219 the calculation led to a rise time of the order of 0.8 nsec. (tr-auth)

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METHOD FOR THE MEASUREMENT OF THE LIFETIME OF THE EXCITED STATE OF AN ATOM

O. Aminian

Published Jul 16, 1962• 0 citations

OpenAlex

Abstract

Related papers

Measurement of the lifetime of the 5d6pF31 state of barium

Paul E. Jessop, F. M. Pipkin

A delayed-coincidence technique has been used to measure the lifetime of the $5d6p^{1}F_{3}$ state of atomic barium. An intermediate, $6s5d^{1}D_{2}$ metastable state of barium atoms in an atomic beam was populated by electron bombardment, and a pulsed cw laser was employed to excite atoms from the metastable state to the $5d6p^{1}F_{3}$ state. A time-to-amplitude convertor was used to measure the time distribution of the fluorescent light. The value obtained for the lifetime was (44.5\ifmmode\pm\else\textpm\fi{}1.8) nsec.A delayed-coincidence technique has been used to measure the lifetime of the $5d6p^{1}F_{3}$ state of atomic barium. An intermediate, $6s5d^{1}D_{2}$ metastable state of barium atoms in an atomic beam was populated by electron bombardment, and a pulsed cw laser was employed to excite atoms from the metastable state to the $5d6p^{1}F_{3}$ state. A time-to-amplitude convertor was used to measure the time distribution of the fluorescent light. The value obtained for the lifetime was (44.5\ifmmode\pm\else\textpm\fi{}1.8) nsec.

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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.

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Applied OpticsApr 1, 196812 citations

A delayed-coincidence technique has been used to measure the lifetime of the

5d6p^{1}F_{3}

state of atomic barium. An intermediate,

6s5d^{1}D_{2}

metastable state of barium atoms in an atomic beam was populated by electron bombardment, and a pulsed cw laser was employed to excite atoms from the metastable state to the

5d6p^{1}F_{3}

state. A time-to-amplitude convertor was used to measure the time distribution of the fluorescent light. The value obtained for the lifetime was (44.5\ifmmode\pm\else\textpm\fi{}1.8) nsec.

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.