Optically pumped pulsed IF(B→X) laser utilizing a CF₃I–NF₂–He mixture

Abstract

Recent investigations showed that the THz photoresponse of quantum Hall systems (QHS) is a complex combination of different mechanisms. In this work, we separate these parts by varying the electron concentration and the source-drain current. For our photoconductivity measurements, we used a pulsed p-Ge cyclotron laser as a monochromatic THz radiation source and changed the magnetic field, the source-drain current and the electron concentration (via a backgate) of the QH sample. The spectral resolution of the QHS was found to improve with increasing values of the source-drain current up to the breakdown of the QH effect.

Rotational effects on the overtone-induced isomerization rate for CHD2NC .fwdarw. CHD2CN

“…These variations are somewhat smaller than those observed experimentally. The bandwidth of 0.01 cm"1 is the minimum spectroscopic bandwidth possible for a 6-Torr sample of this molecule on the basis of the pressure broadening of approximately 1 cm"1/atm observed in high-resolution fundamental spectra.31 At this narrow bandwidth, only [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] transitions contribute to the excited-state population. These calculations suggest that even significant variation of the excited distribution (major errors in the simulation) is unlikely to account for the discrepancy between calculations and experimental data.…”