Excited state spectra and dynamics of phenyl-substituted butadienes

Wallace-Williams, Stacie E.; Schwartz, Benjamin J.; Moeller, Soeren; Goldbeck, Robert A.; Yee, W. Atom; El‐Bayoumi, M. Ashraf; Kliger, David S.

doi:10.1021/j100052a011

Cited by 26 publications

(19 citation statements)

References 3 publications

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“…Figure 1a shows absorption and PL spectra of the parent enyne 2a in ODCB ( ortho ‐dichlorobenzene) and THF. Optical data in ODCB are similar to those of a structurally analogous conjugated oligomer, 1,4‐diphenyl‐1,3‐butadiene,11 which has nominally the same conjugation length. Specifically, absorption and PL spectra are vibrationally structured and demonstrate nearly mirror symmetry at a wavelength of 350 nm.…”

Section: Resultsmentioning

confidence: 55%

Regio‐ and Stereoselective Dimerization of Arylacetylenes and Optical and Electrochemical Studies of (E)‐1,3‐Enynes

et al. 2014

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dihydroimidazol-2-ylidene) promotes regio-and stereospecific dimerization of a variety of arylalkynes to give (E)-1,3enynes in good to excellent yields. An efficient and practical procedure for their synthesis was developed using a biphasic aqueous alkali/heptane system. Optical and electronic properties of (E)-1,3-enynes are highly tunable. Depending on the nature of the substituents, HOMO energies vary in the range 5.3-6.0 eV. (E)-1,3-Enynes can exhibit intense photoluminescence in the spectral region 350-500 nm.

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Section: Resultsmentioning

confidence: 55%

Regio‐ and Stereoselective Dimerization of Arylacetylenes and Optical and Electrochemical Studies of (E)‐1,3‐Enynes

et al. 2014

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“…In 2PAC VUV photons travel on average 2 cm prior to reaching PEN. Assuming conservatively that similar concentration is reached in 2PAC (157 cm 2 of the foil in 8.5 l of LAr) within 40-140 h of data taking and applying the TPB extinction coefficient at 200 nm of 2 × 10 4 (M cm) −1 [24], one arrives at <0.6% contribution from VUV light converted in TPB. Therefore, the effect is small in comparison with other systematic uncertainties and neglected in the analysis.…”

Section: Simulationmentioning

confidence: 96%

Direct comparison of PEN and TPB wavelength shifters in a liquid argon detector

et al. 2021

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A large number of particle detectors employ liquid argon as their target material owing to its high scintillation yield and its ability to drift ionization charge over large distances. Scintillation light from argon is peaked at 128 nm and a wavelength shifter is required for its efficient detection. In this work, we directly compare the light yield achieved in two identical liquid argon chambers, one of which is equipped with polyethylene naphthalate (PEN) and the other with tetraphenyl butadiene (TPB) wavelength shifter. Both chambers are lined with enhanced specular reflectors and instrumented with SiPMs with a coverage fraction of approximately 1%, which represents a geometry comparable to the future large scale detectors. We measured the light yield of the PEN chamber to be 39.4$$\,\pm \,$$ ± 0.4(stat)$$\,\pm \,$$ ± 1.9(syst)% of the yield of the TPB chamber. Using a Monte Carlo simulation this result is used to extract the wavelength shifting efficiency of PEN relative to TPB equal to 47.2$$\,\pm \,$$ ± 5.7%. This result paves the way for the use of easily available PEN foils as a wavelength shifter, which can substantially simplify the construction of future liquid argon detectors.

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“…The absorption length for photons in TPB for wavelengths greater than 250 nm are taken from [19] and is shown in Fig. 11.…”

Section: Modelmentioning

confidence: 99%

“…One commonly used WLS is tetraphenyl butadiene (TPB). TPB thin films have been widely studied [16][17][18][19][20][21][22][23][24][25][26] and are regularly used for many experimental programs [2][3][4][5][6][7][8][9] due to their relatively high efficiency. TPB may also be easily applied to surfaces using standard techniques, such as vacuum deposition in a thermal evaporator.…”

Section: Introductionmentioning

confidence: 99%

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Measurements of the intrinsic quantum efficiency and absorption length of tetraphenyl butadiene thin films in the vacuum ultraviolet regime

2018

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A key enabling technology for many liquid noble gas (LNG) detectors is the use of the common wavelength shifting medium tetraphenyl butadiene (TPB). TPB thin films are used to shift ultraviolet scintillation light into the visible spectrum for detection and event reconstruction. Understanding the wavelength shifting efficiency and optical properties of these films are critical aspects in detector performance and modeling and hence in the ultimate physics sensitivity of such experiments. This article presents the first measurements of the room-temperature microphysical quantum efficiency for vacuum-deposited TPB thin films -a result that is independent of the optics of the TPB or substrate. Also presented are measurements of the absorption length in the vacuum ultraviolet regime, the secondary re-emission efficiency, and more precise results for the "black-box" efficiency across a broader spectrum of wavelengths than previous results. The low-wavelength sensitivity, in particular, would allow construction of LNG scintillator detectors with lighter elements (Ne, He) to target light mass WIMPs.

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Excited state spectra and dynamics of phenyl-substituted butadienes

Cited by 26 publications

References 3 publications

Regio‐ and Stereoselective Dimerization of Arylacetylenes and Optical and Electrochemical Studies of (E)‐1,3‐Enynes

Regio‐ and Stereoselective Dimerization of Arylacetylenes and Optical and Electrochemical Studies of (E)‐1,3‐Enynes

Direct comparison of PEN and TPB wavelength shifters in a liquid argon detector

Measurements of the intrinsic quantum efficiency and absorption length of tetraphenyl butadiene thin films in the vacuum ultraviolet regime

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