Download PDF by Steven J Sweeney: Pulsed and CW laser experiments in cesium and

By Steven J Sweeney

The 1st a part of this dissertation will describe a learn of the rate dependence of the cesium 5DJ +6P J' → 7DJ" +6S 0.5 power pooling technique utilizing molecular photolysis. quick Cs(5 D) atoms with good outlined velocities are created through the molecular photodissociation technique Cs2 +hnu → Cs(6 S)+Cs(5D)+DeltaE. the rate of the quick atoms is managed via the frequency of the pulsed photolysis laser,

In the second one a part of this dissertation, a two-laser scan utilizing OODR and Autler-Townes splittings to figure out NaK 31pi → X1Sigma+, A 1Sigma+ absolute transition dipole second capabilities is defined. Resolved 31pi → A 1Sigma+ and 31pi → X1Sigma+ fluorescence is recorded with the frequencies of a Ti:Sapphire laser (L1) and a hoop dye laser (L2) mounted to excite specific 31pi(19,11,f) ← A1Sigma+(nu',11,e) ← X1Sigma+(nu", J +/- 1,e) transitions. The coefficients of a tribulation transition dipole second functionality mu(R) = a nil + a1R-2 + a2R-4 +... are adjusted to compare the relative intensities of resolved spectral strains terminating on A1Sigma+ (nu',11 ,e) and X1Sigma+ (nu",11,e) degrees. those info offer a relative degree of the functionality mue( R) over a extensive variety of R. subsequent, L2 is tuned to the categorical 31pi(19,11,f) ← A1Sigma+(10,11,e) and 31pi(19,11,f) ← A 1Sigma+(9,11,e) transitions and targeted to an depth big enough to separate the degrees through the Autler-Townes impression. L1 is scanned over the A1Sigma +(10,11,e) ← X1Sigma +(1,J+/-1,e) and A 1Sigma+ (9,11,e) ← X1Sigma+(1,J+/-1, e) transitions, in flip, to probe the AT lineshape, that is healthy utilizing density matrix equations to yield absolute values for [vertical bar]⟨31pi(19,11,f)[vertical bar]mu( R)[vertical bar]A1Sigma+(10,11, e)⟩[vertical bar] and [vertical bar]⟨31pi(19,11,f)[vertical bar]mu( R)[vertical bar]A1Sigma+(9,11, e)⟩[vertical bar]. This price is used to put the relative mu e (R) got with resolved fluorescence onto an absolute scale. For the 31pi → A 1Sigma+ transition, we discover mabse,3→A = 10.7 -- 5.38 (Req/R)2, while for the 31pi → X1Sigma + transition, we discover mabse,3→X = 3.29(Req/R)2 -- 10.7(Req/R)4 +11.9(R eq/R)6 -- 3.76(Req/R )8, either one of that are given in Debye.  Read more...

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Extra info for Pulsed and CW laser experiments in cesium and sodium-potassium vapors: The velocity dependence of 5DJ + 6PJ' going to DJ" + 6S1/2 energy pooling collisions in cesium vapor and absolute transition dipole moments of sodium-potassium 3(1)pi going to X(1)sigm

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Fluorescence was collected by a photomultiplier tube (PMT). The fluorescence signal was fed through a time-to-amplitude converter triggered by the laser pulses, and a multichannel analyzer was used to record the time dependent decay signal. This setup is representative of a typical delayed coincidence lifetime experiment. 24 The resulting data yield an exponential decay curve, just like the Cs(6P3/2) decay curves measured in the cesium energy pooling experiment described later in this thesis. 8 shows an atomic fluorescence decay curve, which is similar to data obtained in the molecular lifetime experiments.

For the determination of lifetimes, the authors fit the double resonance lineshapes at each pressure to a Lorentzian profile. With extrapolation of these results to zero pressure, they were able to determine the effective lifetimes of the Rydberg levels. A third experimental technique for measuring the radiative lifetimes of alkali molecules is referred to as the phase-shift technique. l 9 This group measured the lifetimes of various excited states of several homonuclear alkali molecules including Na2 (B]Tlu), K2 ( S ' l T J , Rb2 (BlUu and ClUu, as later labeled by Amiot122), and Cs2 (DlUu, as later labeled by Kato and Yoshihara123) using various lines of a cw argon ion laser and a helium-neon laser.

Both cases result in the breakup of the molecule into its atomic constituents. 22 v-(AE/m) . In this work, we use the process of molecular photolysis to create a population of excited atoms with well-defined and controllable velocities. Such populations are then used to study the velocity dependence of the cesium 5Dj +6Pr ->7Dr+6SV2 energy pooling collision process (see chapters 3-5). 2 Autler-Townes Splitting and Transition Dipole Moments The second topic investigated in this dissertation is the study of transition dipole moments between electronic states of NaK using resolved fluorescence spectroscopy and measurements of the Autler-Townes splittings of rovibrational levels.

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Pulsed and CW laser experiments in cesium and sodium-potassium vapors: The velocity dependence of 5DJ + 6PJ' going to DJ" + 6S1/2 energy pooling collisions in cesium vapor and absolute transition dipole moments of sodium-potassium 3(1)pi going to X(1)sigm by Steven J Sweeney


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