Note: Inverted time-ordering in two-dimensional-Raman-terahertz spectroscopy of water
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(a) The inverted pulse sequences and (b) the original pulse sequence of Ref. 1. A red pulse depicts a THz field, a pair of blue pulses depicts the two fields necessary to achieve a Raman transition. Panels (c) and (d) show the response functions according to Eqs. (1) and (2), respectively, where red and blue colors depict response of opposite sign. The response function R (I) in panel (d) is adapted from Ref. 1. The time-axis t 1 has been inverted in panel (c) to emphasize the continuity of the overall response function at t 1 = 0. The feature labeled with an asterisk (*) indicates an echo.
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