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Logarithmic based optical delay for time-resolved data collection
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10.1063/1.3474226
/content/aip/journal/rsi/81/9/10.1063/1.3474226
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/9/10.1063/1.3474226

Figures

Image of FIG. 1.
FIG. 1.

Comparison of logarithmic stepping (circles) vs linear stepping (triangles) for a simulated observable. Top trace, displaced by one unit for clarity, shows evenly spaced points while the bottom trace displays points spaced evenly on a logarithmic scale.

Image of FIG. 2.
FIG. 2.

Logarithmic stepping value plotted as function of relative index with (0.667 fs), (2 ns), and equal to 50 (circles), 100 (triangles), and 200 (squares). As increases, the number of repeated data points increases. equal to 100 and 200 stepping functions have been offset by 0.005 and 0.01 ps, respectively.

Image of FIG. 3.
FIG. 3.

Logarithmic stepping value plotted as a function of the data point index with (50), (0.667 fs) constant, and equal to (a) 2 ns, (b), 2 ps, and (c) 10 fs. Note the increase in repeated delay steps at early delay time as approaches the time scale of .

Image of FIG. 4.
FIG. 4.

Uncorrected (upper trace, triangles) vs linear corrected (lower trace, circles) logarithmic stepping values with (200), (0.6667 fs), and (2 ns). The uncorrected values include repeated time delay points while the corrected contains no repeated time delay points. The uncorrected values are displaced by 0.01 ps for clarity.

Image of FIG. 5.
FIG. 5.

Linear (a) and logarithmic (b) broadband ultrafast transient absorption spectrograms of HPTS in pH-7 water. Note that the time delay axis is plotted linearly but represents time delay values with (a) variable linear resolution and (b) logarithmic spacing. Both spectrograms contain 200 spectra with final delay equal to 2 ns.

Image of FIG. 6.
FIG. 6.

Extracted deprotonation dynamics from HPTS/pH-7 water transient absorption data collected with linear (circles) and logarithmic (triangles) stepping. Comparisons between the two methods show that although linear stepping provides effective resolution, logarithmic stepping smoothly adjusts the time stepping on the tens of (a) picosecond and (b) nanosecond time scales. Logarithmic traces (triangles) are displaced by one unit for clarity.

Image of FIG. 7.
FIG. 7.

Extracted Stokes shift dynamics from HPTS/pH-7 water transient absorption data collected with linear (circles) and logarithmic (triangles) stepping. Comparisons between the two methods show that although linear stepping provides effective resolution, logarithmic stepping smoothly adjusts the time stepping. Logarithmic trace (triangles) is displaced by for clarity.

Tables

Generic image for table
Table I.

Analysis of the statistical “efficiency” of HPTS/pH-7 water deprotonation fitted parameters.

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/content/aip/journal/rsi/81/9/10.1063/1.3474226
2010-09-08
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Logarithmic based optical delay for time-resolved data collection
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/9/10.1063/1.3474226
10.1063/1.3474226
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