JP2023512753A - 高角度液体電子断層撮影のためのデバイスおよび方法 - Google Patents
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Abstract
Description
サンプリングを行う逆格子空間の割合が増加した結果、液体セルデバイスが単斜晶相または他の低対称性結晶相などのような低対称性構造の回折によって、信頼性の高い構造決定を得るのに適していることと、一般に、このような高角度範囲データに基づいて、3次元数学的再構成の精度および信頼性が向上し、数学的再構成が実際の試料内部構造により密接に対応するようになることが含まれる。このような液体セルデバイスから得られる高角度範囲データに基づく数学的再構成は、投影アーチファクトをより効果的に克服することが可能である。
概念実証用トモチップおよびHALET
Claims (15)
- 透過電子線機器において、液体媒体中の試料から高角度範囲の傾斜断層撮影データを取得するための液体セルデバイスであって、
対向する第1および第2の本体表面(102、103)と、前記第1および第2の本体表面間に視線(105)を提供し、開口部(104)を通る前記視線(105)に沿って平行に投影される視認可能領域(111)を確立する開口部(104)とを備える本体(101)と、
前記本体(101)によって囲まれ、少なくとも部分的に前記開口部(104)内に含まれる液体アクセス可能容積(106)であって、前記液体セルデバイスの実質的に垂直な回転軸(108)との前記視線の交点(107)を含む、液体アクセス可能容積と、
前記回転軸(108)から実質的に等距離に配置され、それらの共通の表面法線に沿って見たときに少なくとも実質的に重なって、それらの共通の表面法線に沿って測定したギャップによって互いから離間し、各々の膜が、前記液体アクセス可能容積の少なくとも一部を囲むために前記開口部を覆って密閉するように構成された、少なくとも実質的に平面で平行な第1および第2の電子透過膜(109、110)と、を備えた液体セルデバイスであって、
前記第1および第2の膜(109、110)、本体第1および第2の表面(102、103)、および開口部(104)は、前記液体セルデバイスが、少なくとも120度の角度範囲内で前記回転軸(108)の周りを回転する間、前記液体アクセス可能容積(106)の一部分を通る投影視認可能領域(111、211,218、219)が、前記本体(101)によって影になることなく、少なくとも10μm2前後の上に維持されるように、サイズ決めされ、形状決めされ、互いに相対して配置され、
実質的に角度範囲の中点において、前記視線(105)が前記第1および第2の膜(109、110)に実質的に垂直に整列し、前記投影視認可能領域(111、211)は、実質的に最大であることを特徴とする、液体セルデバイス。 - 前記角度範囲が、少なくとも140度である、請求項1に記載の液体セルデバイス。
- 前記維持された投影視認可能領域は、少なくとも100μm2である、請求項1または2に記載の液体セルデバイス。
- 前記第1および第2の電子透過膜は、実質的に類似した形状およびサイズであり、実質的にその形状およびサイズの窓を形成する、請求項1~3のいずれかに記載の液体セルデバイス。
- 前記第1および第2の電子透過膜は、前記液体セル回転軸に垂直な平面との交線に垂直な方向に沿って測定した幅と、前記液体セル回転軸に垂直な平面との交線に平行な方向に沿って測定した長さとを有し、前記幅は、前記長さより小さく、よって長手の窓を形成している、請求項1~4のいずれかに記載の液体セルデバイス。
- 前記長手の窓幅は、90μm以下であり、長さは、少なくとも350μmである、請求項5に記載の液体セルデバイス。
- 前記第1の窓と直交して交差するように配置された第2の長手の窓をさらに備える、請求項5または6に記載の液体セルデバイス。
- 前記第1の長手の窓と平行且つ隣接して配置された第2の長手の窓をさらに備える、請求項5~7のいずれかに記載の液体セルデバイス。
- 基準窓をさらに備える、請求項5~8のいずれかに記載の液体セルデバイス。
- 透過電子線機器において高角度傾斜断層撮影データを取得するために、液体媒体中の試料を作製するための方法であって、
請求項1~9のいずれかに記載の液体セルデバイスの前記液体アクセス可能容積内に液体媒体中の試料を導入することを含む、方法。 - 前記液体セルデバイスを前記透過電子線機器内に導入することと、
前記液体アクセス可能容積内の前記試料を、前記透過電子線機器で生成された入射電子線に曝露することと、
少なくとも120度の角度範囲にわたって、前記液体セルデバイスをその回転軸周りで傾斜させている間に前記試料からデータを取得することと、をさらに含む、請求項10に記載の方法。 - 前記データは、EDSデータ、または、回折、撮像、またはEELSデータを含む、前記試料を透過した電子から取得したデータを含む、請求項11に記載の方法。
- 断層像再構成が前記データに適用されて、前記試料の少なくとも一部分の3次元内部構造を明らかにする、請求項11または12に記載の方法。
- 前記試料の実質的な部分が、前記データ取得中は十分な不動性を維持することを保証するギャップを第1および第2の電子透過膜の間に有して、信頼性の高い断層像再構成を可能とする液体セルデバイスを選択することさらに含む、請求項10~13のいずれかに記載の方法。
- 前記試料は、多数の結晶を含み、前記方法は、前記多数の結晶が、少なくとも実質的にランダムな配向分布を有することを保証するギャップを第1および第2の電子透過膜の間に有する液体セルデバイスを選択することをさらに含む、請求項10~14のいずれかに記載の方法。
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PCT/EP2020/087220 WO2021123305A1 (en) | 2019-12-18 | 2020-12-18 | Devices and methods for high angle liquid electron tomograpy |
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