Stimulated emission pumping (SEP) is a new method for sub‐Doppler spectroscopy and efficient state‐selective preparation of highly excited rotational–vibrational levels of small molecules. The sensitivity of SEP has been examined by exciting the I2(B 0+u–X 1Σ+g) 17–0 P(38) line and stimulating the P(38) and R(36) lines of the 17–11, 17–10, and 17–9 bands. All observed effects when the two laser pulses were temporally separated could be accounted for by a master equation model.

Selective vibrational excitation by stimulated emission pumping

An in extenso analysis of the (B-X) I2 iodine absorption spectrum recorded by means of Fourier Transform Spectroscopy is presented. It is shown that the 100 000 recorded transitions covering the 11 000-20 040 cm-1 range and published in several Atlases may be recalculated by means of only 46 constants : 45 are Dunham coefficients describing the vibrational and rotational constants of both X state (up to v" = 19) and B state (up to v' = 80, situated only at 1.6 cm-1 from the dissociation limit of the B state), and one empirical scaling factor which takes account of neglected centrifugal constants higher than Mv. The overall standard error between computed and measured wavenumbers is equal to 0.002 cm -1 in agreement with the differences of numerous independent absolute wavenumbers and the computed ones.

https://hal.archives-ouvertes.fr/jpa-00210032/document

Description of the absorption spectrum of iodine recorded by means of Fourier Transform Spectroscopy : the (B-X) system

,\\ . \\ Krlshnan Baiasukamanian has been an Assmiate Professw of CblIWty slna, 1987 at Arkma State UntverSHy. Tempe. AZ. He was born in Bangalore. Indla. in 1956. He received his MSc. (Hawrs) desee from the &! a 1e of Techndogy and sdence. Pilani. India. in 1977 and his M.A. and Ph.D. degrees from The Johns Hopkims LhiverSny in 1980. He was a pcstdoctaai assodate and visiting lectuer in ttm Depamnent of Chemishy and Lawrence Berkeley Laboratwy. University of California. Berkeley. from 1980 to 1983. From 1983 1

Spectroscopic constants and potential-energy curves of heavy p-block dimers and trimers.

Picosecond transient absorption measurements from 1000–295 nm are used to monitor the recombination dynamics of iodine after photodissociation in a variety of inert solvents The high time resolution and signal‐to‐noise ratio of these measurements permits the development of a detailed model of this reaction, which should resolve disagreements over the time scales of geminate recombination and vibrational relaxation and over the role of excited electronic state trapping Most of the atoms which undergo geminate recombination do so in ≤15 ps, in agreement with the predictions of existing molecular dynamics simulations The subsequent vibrational and electronic energy relaxation of the recombined molecule is relatively slow and accounts for most of the transient absorption dynamics The relaxing X‐state vibrational population distribution is extracted with an approximate method using calculated spectra of the excited vibrational levels and is compared to recent models Vibrational relaxation times vary from 

Studies of chemical reactivity in the condensed phase. I. The dynamics of iodine photodissociation and recombination on a picosecond time scale and comparison to theories for chemical reactions in solution

Three rare gas halide (RgX−) anions, ArBr−, ArI−, and KrI−, and the corresponding open‐shell van der Waals complexes, ArBr, ArI, and KrI, were studied with anion zero electron kinetic energy (ZEKE) spectroscopy. Photodetachment of each anion accesses the three lowest‐lying electronic states (the X1/2, I3/2, and II1/2 states) of the neutral complex. The spectra for each system reveal well‐resolved progressions in the low frequency vibrations of the anion and the three neutral electronic states, providing a detailed spectroscopic probe of the Rg⋅X− and Rg⋅X interaction potentials. The line shapes observed in the ZEKE spectra are analyzed in terms of the line strengths of the underlying rotational transitions. From our data, we construct the potential energy curve for each neutral state as well as for the anion, and these interaction potentials are compared to potentials obtained from scattering and ion mobility experiments.

/pdf/study-of-the-arbr-ari-and-kri-anions-and-the-corresponding-2uqd940n2i.pdf

Study of the ArBr−, ArI−, and KrI− anions and the corresponding neutral van der Waals complexes by anion zero electron kinetic energy spectroscopy

Noble gas halides: The B → X and D → X systems of 136Xe35Cl

Reinterpretation of the emission spectrum of I2 in argon

Analysis of the 2770-Å emission system in I2

Reanalysis of the D → X fluorescence spectrum of I2

A method for studying the pressure and temperature dependence of rare gas halide and halogen emissions is described. The tesla discharge utilized in this method is characterized in detail with respect to its temporal behavior and its radiant output. The light is found to be produced in moderately intense pulses as short as 0.5 μs in duration. Average dc radiant powers for strong emitters can exceed 5 mW. The method appears suitable for the study of most emitters that can be produced by electron beam excitation.

The tesla discharge as a spectroscopic source for the study of excimer laser transitions.

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