Detection of stimulated emission pumping via degenerate four-wave mixing

Abstract

The stimulated emission pumping (SEP) process has been detected by means of a newly developed zero-background scheme based upon the Doppler-free technique of degenerate four-wave mixing (DFWM) spectroscopy. Rotationally resolved SEP-DFWM spectra recorded for the (02000) vibrational level of CS2 X̃ 1∑+g exhibit signal-to-noise ratios approaching 1000:1.

Dynamics Study of the O2(v) + HO2 Atmospheric Reaction

“…Examples of common and naturally occurring processes that lead to the formation of vibrationally excited molecules are exothermic chemical reactions, ultraviolet photodissociation, and electrical discharges. In fact, with the further development of stimulated emission pumping [1][2][3][4][5][6][7][8][9] and overtone pumping, 10-17 investigation of collisional properties of vibrationally hot molecules has blossomed. Moreover, for vibrationally excited diatomic species, fully quantum-state-resolved experiments are possible and quantum mechanical identification of all excited states is unambiguous.…”

Degenerate and two‐color resonant four‐wave mixing of C2− in a molecular beam environment

“…The experiment in the (1,1) band region suggests that rotational characterization of highlying vibrational states on the ground potential energy surface of anions is feasible by the stimulated emission pumping (SEP) capabilities of TC-RFWM. [48,63] …”

“…Furthermore, rotational characterization of high-lying vibrational states on the ground potential energy surface is feasible by the stimulated emission pumping (SEP) variant of TC-RFWM. [48,63] In spite of the quadratic dependence of the four-wave mixing signal on number density, [64] we have shown recently that DFWM and TC-RFWM techniques are sufficiently sensitive for the detection and characterization of low-abundance molecules. Substantial SNRs have been obtained for transient species in a molecular beam that are generated in a discharge assembly prior to supersonic expansion.…”

Sub-Doppler nonlinear spectroscopy as a probe of photodissociation dynamics

“…ESIIEb, EIIEf, and Eb..LEf) followed by(2) numerical integration of the resulting expression over model velocity distributions. Normalization of integrated DFWM peak areas by the square modulus of the appropriate (-o ; o ,-o,, Cob) value enabled the pertinent population data to be extracted.…”